The source code to VVVVVV
Collection of utilities that interact with the Blooket API / website
3D Engine c++
GemRB is a portable open-source implementation of the Infinity Engine
A MUD client for Android, iOS, Linux, Mac OS X and Windows
ZED OS the clone of Windows XP
Reactive extensions for Unity
A cross-platform interpreter for many point-and-click adventure games
2D physics engine for games