A development environment focused on modding
Desktop/Android/HTML5/iOS Java game development framework
Open game and rendering engine packed into a JavaScript framework
DeSmuME is a Nintendo DS emulator
One framework for creating powerful cross-platform games
Free and open source real-time strategy game
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cross-Platform C++ 2D/3D game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
LayaAir is an open-source 2D/3D engine
A charting and data visualization library for Unity
3D Procedural Game Engine Using OpenGL
Java/JavaFX/Kotlin Game Library (Engine)
Gideros Release version
Powerful, mature open-source cross-platform game engine for Python
Doom-based AI research platform for reinforcement learning
A isometric city builder in JavaScript
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
3D game engine/framework in C, with Luajit and Python bindings now
Embeddable unity game engine view for Flutter
Flax Engine, multi-platform 3D game engine
Toolkit for developing and comparing reinforcement learning algorithms
Parabator 2 - Free 3d board game