Cocos simplifies game creation and distribution with Cocos Creator
Cross-platform game engine in Rust
Open source library for creative expression on the web, desktop, etc.
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
ZED OS the clone of Windows XP
Character animation system for games and simulations.
Reactive extensions for Unity
Egret is a brand new open mobile game and application engine
2D physics engine for games
A cross-platform OpenGL based lightweight scenegraph library