Cross-Platform C++ 2D/3D game engine
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Cocos simplifies game creation and distribution with Cocos Creator
A game engine powered by python and panda3d
Fast and lightweight JavaScript game engine built on WebGL and glTF
Free game engine for development of desktop, mobile, and web games
A modular Common Lisp game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
LayaAir is an open-source 2D/3D engine
Cross-platform 2D and 3D game engine with modular architecture
A complete 3-D game development suite written in Java
Voxel game engine in C++ with OpenGL
3D Procedural Game Engine Using OpenGL
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
3D game engine/framework in C, with Luajit and Python bindings now
Powerful, mature open-source cross-platform game engine for Python
3D and 2D game engine written in Rust
3D Game engine with editor
Voxel game-creation platform with easy modding and game creation
Stride (formerly Xenko), a free and open-source cross-platform C# game
utility collection for 2D game development in Java; sound-player
Zig game engine & graphics toolkit
Multi-platform 2D and 3D game engine
Go bindings for raylib, a simple and easy-to-use library
Open source library for creative expression on the web, desktop, etc.