Fast and lightweight JavaScript game engine built on WebGL and glTF
A development environment focused on modding
Cross-Platform C++ 2D/3D game engine
Game engine supporting many 3D/2D formats and graphic effects
Java/JavaFX/Kotlin Game Library (Engine)
Powerful, mature open-source cross-platform game engine for Python
Magic Another Game Engine
LayaAir is an open-source 2D/3D engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
3D game engine/framework in C, with Luajit and Python bindings now
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Doom-based AI research platform for reinforcement learning
3D Procedural Game Engine Using OpenGL
Embeddable unity game engine view for Flutter
GemRB is a portable open-source implementation of the Infinity Engine
An isometric arcade-style game of skill, puzzles and exploration
A modern, cross-platform Quake game engine based on FitzQuake.
Odamex is a free, cross-platform, modern client-server Doom engine
A cross-platform port of Hexen II game.
0 A.D. is a free, open-source, cross-platform real-time strategy game.