Free asset libraries for game dev

6 picks, each scored out of 18 on how well an AI agent can drive it. How scoring works

Codex CLI
Open source terminal agent from OpenAI with MCP client support and sandboxed command runs.
- MCP
- CLI
- Text
- Open
Free tier17
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
AI coding agentsApache 2.0 CLI; model usage via ChatGPT plan or API134,915 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
Gemini CLI
Open source terminal agent with a generous free quota, large context and MCP support.
- MCP
- CLI
- Text
- Open
Free tier17
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
AI coding agentsApache 2.0; free quota with Google account108,780 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
Claude Code
Terminal agent that edits whole projects, runs the headless engine and connects to any MCP bridge above.
- MCP
- CLI
- Text
- llms.txt
Paid16
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
AI coding agentsClaude subscription or API usageLink verified Nov 11, 2026
earshot
Gives coding agents ears: MCP tools that describe, rank, measure and critique sound, CPU only.
- MCP
- CLI
- Open
Free16
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Mostly text; some binary assets.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
AudioOpen source4,525 GitHub starsLast commit Nov 6, 2026Link verified Nov 11, 2026
Godot
Scenes (.tscn) and GDScript are plain text an agent edits directly, and the editor runs headless for builds and tests.
- CLI
- Text
- Open
Free16
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
EnginesMIT119,996 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
three.js
The default 3D library for the web; huge example corpus means agents rarely guess.
- CLI
- Text
- Open
- llms.txt
Free16
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
EnginesMIT118,182 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
Bevy
Code-only Rust ECS engine: the whole game is source files, and the compiler checks agent edits.
- CLI
- Text
- Open
Free15
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
EnginesMIT or Apache 2.049,695 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
Blender MCP
Agent runs Python inside live Blender, pulls Poly Haven assets and calls Hyper3D generation.
- MCP
- Open
Free15
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Mostly text; some binary assets.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Engine MCP bridgesMIT34,043 GitHub starsLast commit Nov 4, 2026Link verified Nov 11, 2026
Blockbench MCP
Plugin that exposes Blockbench modeling, texturing and animation to MCP clients.
- MCP
- Text
- Open
Free15
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Some automation (plugin scripting inside the GUI).
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Engine MCP bridgesGPL 3.0618 GitHub starsLast commit Nov 7, 2026Link verified Nov 11, 2026
Defold
Small 2D-first engine with text collection files, Lua scripts and the bob.jar command line builder.
- CLI
- Text
- llms.txt
Free15
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free to use, or source available.
Active in 2026
Commits or releases in the last 30 days.
EnginesDefold License (source available, free)6,462 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
GitHub Copilot
Agent mode in VS Code and Rider plus a cloud coding agent that opens PRs; MCP capable.
- MCP
- Text
- llms.txt
Free tier15
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
AI coding agentsFree plan with limits; Pro paidLink verified Nov 11, 2026
Godot MCP
Lets an agent launch the Godot editor, run the project and read debug output, closing the edit and test loop.
- MCP
- CLI
- Text
- Open
Free15
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Occasional 2026 updates.
Engine MCP bridgesMIT6,610 GitHub starsLast commit Apr 16, 2026Link verified Nov 11, 2026
Tiled
2D tile map editor with XML or JSON maps, CLI export and a JavaScript scripting API.
- CLI
- Text
- Open
Free15
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Level designGPL 2.0; pay what you want13,049 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
Unity-MCP (AI Game Developer)
Unity MCP plus CLI and runtime tools; any C# method becomes an agent tool with one attribute.
- MCP
- CLI
- Open
Free15
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Engine MCP bridgesApache 2.04,627 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
Aseprite MCP
Lets an agent draw, fill and export sprites through Aseprite's Lua API.
- MCP
- CLI
- Open
Free14
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Engine MCP bridgesMIT (needs Aseprite)976 GitHub starsLast commit Nov 3, 2026Link verified Nov 11, 2026
Blender
Full 3D suite with a complete Python API and `blender -b` headless mode; the most agent-drivable DCC.
- CLI
- Open
Free14
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
3DGPL21,883 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
Blockbench
Low-poly and voxel-style modeler whose .bbmodel files are readable JSON.
- Text
- Open
Free14
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Some automation (plugin scripting inside the GUI).
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
3DGPL 3.06,192 GitHub starsLast commit Nov 5, 2026Link verified Nov 11, 2026
Cursor
AI code editor with agent mode, MCP servers and a CLI agent; good for C# and C++ engine code.
- MCP
- Text
Free tier14
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
AI coding agentsHobby free; Pro paidLink verified Nov 11, 2026
GdUnit4
Godot test framework with scene runners, input simulation, C# support and a CI action.
- CLI
- Text
- Open
Free14
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Testing and perfMIT1,301 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
LÖVE
Tiny Lua 2D framework: a game is a folder of .lua files, run with one command.
- CLI
- Text
- Open
Free14
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Engineszlib8,943 GitHub starsLast commit Nov 5, 2026Link verified Nov 11, 2026
Phaser
HTML5 game framework in plain JS or TS, the language agents write best, with instant browser preview.
- CLI
- Text
- Open
Free14
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
EnginesMIT40,697 GitHub starsLast commit Aug 21, 2026Link verified Nov 11, 2026
Poly Haven
CC0 HDRIs, PBR textures and models with a public API, already wired into Blender MCP.
- CLI
- Open
- llms.txt
Free14
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Asset librariesCC0Link verified Nov 11, 2026
Unity MCP
Bridge from Claude, Cursor and others into the Unity Editor: scenes, assets, scripts and console.
- MCP
- Open
Free14
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Engine MCP bridgesMIT15,895 GitHub starsLast commit Oct 30, 2026Link verified Nov 11, 2026
Unreal MCP
MCP server plus a native C++ automation bridge: agents spawn actors, edit Blueprints and run the editor.
- MCP
- Open
Free14
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Engine MCP bridgesMIT1,032 GitHub starsLast commit Nov 10, 2026Link verified Nov 11, 2026
Aseprite
The pixel art and sprite animation standard, with a batch CLI, Lua scripting and JSON sheet export.
- CLI
Paid13
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Free to use, or source available.
Active in 2026
Commits or releases in the last 30 days.
2D and pixel$19.99 one-time; source available to build yourself40,865 GitHub starsLast commit Nov 10, 2026Link verified Nov 11, 2026
Dialogue Manager
Branching dialogue written in a screenplay-like .dialogue text format agents can author.
- Text
- Open
Free13
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Godot add-onsMIT3,980 GitHub starsLast commit Nov 6, 2026Link verified Nov 11, 2026
ElevenLabs Sound Effects
Text to sound effects and voice over an API, with an official hosted MCP server (OAuth, nothing to install).
- MCP
- CLI
- llms.txt
Free tier13
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
AudioFree monthly credits; paid plansLink verified Nov 11, 2026
func_godot
Imports TrenchBroom .map files into Godot scenes, so text levels become playable geometry.
- Text
- Open
Free13
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Level designMIT889 GitHub starsLast commit Nov 8, 2026Link verified Nov 11, 2026
GUT
Godot unit testing in GDScript, runnable from the command line so agents can verify their own edits.
- CLI
- Text
- Open
Free13
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
Testing and perfMIT2,782 GitHub starsLast commit Aug 18, 2026Link verified Nov 11, 2026
LDtk
Modern 2D level editor from the Dead Cells director; one JSON file with a published schema.
- Text
- Open
Free13
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Some automation (plugin scripting inside the GUI).
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Level designMIT4,895 GitHub starsLast commit Nov 5, 2026Link verified Nov 11, 2026
LimboAI
Behavior trees plus hierarchical state machines for Godot NPCs, with a visual debugger.
- Text
- Open
Free13
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Godot add-onsMIT3,117 GitHub starsLast commit Oct 30, 2026Link verified Nov 11, 2026
Maaack's Game Template
Main, pause and options menus, loading screens and input rebinding as plain scenes, the shell every build needs.
- Text
- Open
Free13
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Godot add-onsMIT1,732 GitHub starsLast commit Oct 29, 2026Link verified Nov 11, 2026
Meshy
Text and image to textured 3D models over a REST API, with an official MCP server.
- MCP
- CLI
- llms.txt
Free tier13
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
3DFree credits monthly; paid plansLink verified Nov 11, 2026
Phantom Camera
Cinemachine-style cameras for Godot: follow, framing and blends set as node properties.
- Text
- Open
Free13
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Godot add-onsMIT3,657 GitHub starsLast commit Nov 9, 2026Link verified Nov 11, 2026
PixelLab
AI pixel art: characters with directional views, animations and tilesets, via API and MCP.
- MCP
- CLI
- llms.txt
Free tier13
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
2D and pixelFree trial; paid plansLink verified Nov 11, 2026
RenderDoc
Standard GPU frame debugger with a Python API and command line capture.
- CLI
- Open
Free13
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Testing and perfMIT11,300 GitHub starsLast commit Nov 11, 2026Link verified Nov 11, 2026
RenderDoc MCP
Hands GPU frame captures to an agent: draw calls, state and resources, for rendering bugs.
- MCP
- Open
Free13
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
Engine MCP bridgesMIT383 GitHub starsLast commit Jun 9, 2026Link verified Nov 11, 2026
Beehave
Node-based behavior trees in pure GDScript; trees live in the scene file.
- Text
- Open
Free12
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
Godot add-onsMIT3,325 GitHub starsLast commit Sep 20, 2026Link verified Nov 11, 2026
Dialogic 2
Timeline editor for characters, portraits and events; timelines save as readable text.
- Open
Free12
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Mostly text; some binary assets.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Godot add-onsMIT (2.0 still alpha)6,165 GitHub starsLast commit Nov 7, 2026Link verified Nov 11, 2026
ProtonScatter
Procedural placement of props, grass and rocks along shapes, defined as stacked text resources.
- Text
- Open
Free12
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
Godot add-onsMIT3,027 GitHub starsLast commit Sep 27, 2026Link verified Nov 11, 2026
TrenchBroom
Brush-based 3D level editor; Quake .map files are plain text geometry.
- Text
- Open
Free12
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Some automation (plugin scripting inside the GUI).
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Level designGPL 3.02,904 GitHub starsLast commit Nov 10, 2026Link verified Nov 11, 2026
Tripo
Fast image to 3D with auto rigging, an API and an official MCP server.
- MCP
- CLI
- llms.txt
Free tier12
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Regular 2026 releases or commits.
3DFree credits; paid plansLink verified Nov 11, 2026
Unity
Biggest asset and tutorial ecosystem; batchmode builds and strong community MCP bridges make it agent-workable.
- llms.txt
Free tier12
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
EnginesPersonal free under revenue cap; Pro paidLink verified Nov 11, 2026
Unreal Engine
Top-end 3D with editor Python scripting and commandlets; agents work through MCP bridges since assets are binary.
- llms.txt
Free tier12
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free to use, or source available.
Active in 2026
Commits or releases in the last 30 days.
EnginesFree until $1M gross revenue, then 5% royaltyLink verified Nov 11, 2026
ambientCG
CC0 PBR materials and HDRIs with a JSON API for scripted downloads.
- CLI
- Open
Free11
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Asset librariesCC0Link verified Nov 11, 2026
Freesound
Huge Creative Commons sound library with a search and download API; filter to CC0.
- CLI
- Open
Free11
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
AudioPer-sound CC licensesLink verified Nov 11, 2026
Higgsfield 3D
Image to GLB generation plus image and video models, all behind one official MCP server.
- MCP
- llms.txt
Free tier11
MCP or agent integration
Official MCP server or first-party agent integration.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
3DCredits; paid plansLink verified Nov 11, 2026
Hyper3D Rodin
High quality text and image to 3D; built into Blender MCP so agents can generate in-scene.
- CLI
- llms.txt
Free tier11
MCP or agent integration
Mature community MCP server or plugin, widely used.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
3DTrial credits; paid plansLink verified Nov 11, 2026
Juicee
Game feel graphs for Godot: hit-stop, flashes, punches and shakes without hand-written tweens.
- Open
Free11
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Mostly text; some binary assets.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Godot add-onsMIT172 GitHub starsLast commit Oct 14, 2026Link verified Nov 11, 2026
Pixelorama
Open source pixel editor built in Godot, with command line export.
- Open
Free11
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
2D and pixelMIT11,071 GitHub starsLast commit Nov 10, 2026Link verified Nov 11, 2026
Spine
2D skeletal animation with JSON skeleton data and a command line exporter.
- CLI
Paid11
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Full headless CLI or HTTP API; runs in CI.
Text project files
Mostly text; some binary assets.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Paid only.
Active in 2026
Commits or releases in the last 30 days.
AnimationEssential $69, Professional $3695,359 GitHub starsLast commit Nov 10, 2026Link verified Nov 11, 2026
Terrain3D
High performance editable terrain for Godot in C++, with a GDScript API for generation.
- Open
Free11
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Godot add-onsMIT4,762 GitHub starsLast commit Nov 10, 2026Link verified Nov 11, 2026
Tracy
Frame profiler for CPU, GPU and memory, with capture and CSV export tools for headless runs.
- Open
Free11
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Testing and perfBSD 3-Clause17,111 GitHub starsLast commit Nov 10, 2026Link verified Nov 11, 2026
Debug Draw 3D
One-line calls to draw rays, paths and volumes in game, so agents can make their logic visible in screenshots.
- Open
Free10
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Mostly text; some binary assets.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Occasional 2026 updates.
Godot add-onsMIT1,080 GitHub starsLast commit Apr 4, 2026Link verified Nov 11, 2026
jsfxr
Retro sound effect generator whose sounds are small parameter strings an agent can write.
- Text
- Open
Free10
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Plain, diffable text an LLM can read and edit directly.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Occasional 2026 updates.
AudioUnlicense464 GitHub starsLast commit May 5, 2026Link verified Nov 11, 2026
LibreSprite
Free GPL fork of old Aseprite with the same batch CLI basics and JavaScript scripting.
- Open
Free10
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
2D and pixelGPL 2.08,780 GitHub starsLast commit Oct 30, 2026Link verified Nov 11, 2026
Godot VAT plugin
Vertex animation textures on MultiMesh: hundreds of animated characters in one draw call.
- Open
Free9
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Text exists but is noisy (GUIDs, generated YAML) or export only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
Godot add-onsMIT131 GitHub starsLast commit Oct 5, 2026Link verified Nov 11, 2026
Poly Pizza
Searchable low-poly model library with an API; searchable from Blender MCP setups.
- Open
Free9
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Scriptable or batch mode, with gaps.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
Asset librariesCC0 and CC-BY per modelLink verified Nov 11, 2026
Rive
Interactive vector animation with state machines, runtimes for Unity, Unreal and the web.
- llms.txt
Free tier9
MCP or agent integration
Unofficial or early MCP server, or works through another tool's MCP.
Headless, CLI or API
Some automation (plugin scripting inside the GUI).
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough docs plus llms.txt or a docs MCP.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
AnimationFree plan; paid seatsLink verified Nov 11, 2026
Kenney
Tens of thousands of consistent CC0 sprites, models, UI and audio; perfect placeholder to ship quality.
- Open
Free8
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Some automation (plugin scripting inside the GUI).
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Commits or releases in the last 30 days.
Asset librariesCC0Link verified Nov 11, 2026
Cascadeur
Physics-assisted keyframe animation with AutoPosing and a Python API.
Free tier7
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
Some automation (plugin scripting inside the GUI).
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Thorough reference docs.
Open source or free tier
Free tier or free under a revenue cap.
Active in 2026
Commits or releases in the last 30 days.
AnimationFree under revenue cap; Pro paidLink verified Nov 11, 2026
Quaternius
CC0 low-poly packs with rigged and animated characters in glTF and FBX.
- Open
Free6
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
GUI only.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Regular 2026 releases or commits.
Asset librariesCC0Link verified Nov 11, 2026
OpenGameArt
Long-running community library of free 2D, 3D and audio assets under open licenses.
- Open
Free5
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
GUI only.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Open source (OSI license) or CC0.
Active in 2026
Occasional 2026 updates.
Asset librariesPer-asset licensesLink verified Nov 11, 2026
Sonniss GDC Bundle
Yearly multi-gigabyte pack of pro game SFX, royalty free for commercial use.
Free5
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
GUI only.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Free to use, or source available.
Active in 2026
Regular 2026 releases or commits.
AudioRoyalty free, no attributionLink verified Nov 11, 2026
Mixamo
Free auto rigging and a large mocap clip library for humanoids; still the fastest rig for prototypes.
Free4
MCP or agent integration
No way for an agent to drive it.
Headless, CLI or API
GUI only.
Text project files
Binary or opaque outputs only.
Docs and llms.txt
Usable docs with gaps.
Open source or free tier
Free to use, or source available.
Active in 2026
Occasional 2026 updates.
AnimationFree with Adobe IDLink verified Nov 11, 2026

6 tools