Cocos simplifies game creation and distribution with Cocos Creator
Multi-platform 2D and 3D game engine
A certain block game
UCI chess engine
The game engine for everyone
Desktop/Android/HTML5/iOS Java game development framework
Home theater software and entertainment hub for digital media
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
3D Engine c++
GemRB is a portable open-source implementation of the Infinity Engine
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
3D modeler, 3D game maker, 3D demo maker
... the open-source glide computer
Old style soccer game with many exciting features
Orx: Data-Driven Game Engine
Fltk applications developed by me
Urho3D Game engine
The AWS GameKit Plugin for Unreal
Sdk library for creating 2048 game in c#.
2D Game Engine
Cross-platform 2D and 3D game engine