Android, UIQ 3.0, Series 60 Edition 5 open-source software
3D Engine c++
GemRB is a portable open-source implementation of the Infinity Engine
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Free and Open Game Programming Language for Windows and GNU/Linux
God game: wage war from the stone age to the future
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons
A cross-platform interpreter for many point-and-click adventure games
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
This is a hacking style game set in the early '80s
Cross platform Game Creation Software
Source code of the game "Color Flood Filler" for Android OS
2D physics engine for games
cross-platform 2d game engine
QBall is a simple breakout style game for Android, Symbian and others.