GemRB is a portable open-source implementation of the Infinity Engine
PyMancala: A Python API for the Mancala game
The AWS GameKit Plugin for Unreal
Blind Chess using Taiwan rule
ZED OS the clone of Windows XP
Character animation system for games and simulations.
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A simple 2D platformer, written in python2.7
A powerful cross-platform and open-source 3-D rendering engine.
... the open-source glide computer