Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
The library needed to make all those games true
Cinema Enters Game Console
Quake PAK file utility
2D Game Engine
Sdk library for creating 2048 game in c#.
mGSTEP port of the Cube game engine
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
The imaginary eight-bit machine
Modern 3D engine and IDE written using C# and C++.
A distributed graph deep learning framework.
A 2D game engine and level editor
8-bit Graphical API for Java
IGS Labs
A cross platform Lua based game engine
Cross-platform 2D and 3D game engine
Android OpenGL Game Engine
Free and Open Game Programming Language for Windows and GNU/Linux
Portable game engine with main focus on point-and-click adventures
Javascript Canvas Framework
Build Cross-platform Applications
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.