scene-oriented, flexible 3D engine (C++, Python, C#, Java)
UI Automation Framework for Games and Apps
GemRB is a portable open-source implementation of the Infinity Engine
... the open-source glide computer
An Operating System Created In Html CSS And JS By Muhammad Haris.
Cerberus Content Management System
PyMancala: A Python API for the Mancala game
The AWS GameKit Plugin for Unreal
ZED OS the clone of Windows XP
Character animation system for games and simulations.
Smart phone automation tool. Support iOS, Android, WebApp and game
JVM Bullet Physics SDK
Cocos2d for iOS and OS X, built using Objective-C
The Perfect core toolset and framework for Swift Developers