Unity

Freemium

Cross-platform 2D and 3D engine with a large asset ecosystem; C# scripting and an editor for desktop, mobile, web and XR.

Unreal Engine

Free

Epic's real-time 3D engine with full source access, C++ and Blueprint visual scripting, for high-fidelity games.

Godot Engine

★ 118.6k

Open-source 2D and 3D engine with its own editor, GDScript and C# support; no royalties or fees.

A

Aseprite

★ 40.2k

Animated sprite editor and pixel-art tool with layers, frames, tags and sprite-sheet export.

T

Tiled

★ 13.0k

Flexible tile-map level editor with exports for many engines and formats.

B

Blender

★ 21.0k

Free 3D suite for modelling, sculpting, rigging, animation and rendering; exports to all major engines.

F

FMOD

Freemium

Adaptive audio middleware with the FMOD Studio authoring tool and an engine with integrations for many game engines.

S

Spine

Paid

2D skeletal animation editor with runtimes for popular engines and frameworks.

M

Mirror

★ 6.4k

Open-source networking library for Unity, derived from UNet.

U

Unreal Engine MCP (Claude Code plugin)

★ 1.3k

Epic Games' official Claude Code plugin: drive Unreal Editor over MCP with hundreds of tools across 30+ toolsets (actors, Blueprints, materials, Niagara, Control Rigs, Sequencer).

U

Unreal MCP (editor plugin)

Free

Embeds an MCP server in Unreal Editor so MCP-compatible clients can drive the editor over local HTTP; toolsets come from the Toolset Registry and All Toolsets plugins.

Sets up Claude Code as a small studio: 49 agents in a studio hierarchy, 74 workflow skills, hooks and rules, with design reviews and QA gates.

O

Ollama

★ 183.7k

Easiest local model server for prototyping, but a separate install the player must have.

L

llama.cpp

★ 131.6k

The base runtime most Unity/Unreal/Godot LLM plugins wrap; very active. Start here if you want control.

PlayCanvas

★ 17.1k

Web graphics runtime built on WebGL, WebGPU, WebXR and glTF for browser games and 3D apps.

S

SDL

★ 16.8k

Cross-platform library for windowing, input, audio and graphics access.

K

KoboldCpp

★ 12.0k

Great one-file local server for roleplay; AGPL is a concern for bundling.

K

Krita

★ 10.6k

Free digital painting application, widely used for concept art, textures and 2D assets.

Defold

★ 6.4k

Lightweight engine for 2D and 3D games with Lua scripting, built for desktop, console, mobile and web builds.