GemRB is a portable open-source implementation of the Infinity Engine
4X Space Strategy Game
Cooperative multiplayer graphical RPG and adventure game
INSTEAD - Simple Text Adventure Interpreter.
A MUD client for Android, iOS, Linux, Mac OS X and Windows
A 2D scrolling platform shooter, inspired by Duke Nukem 1
WW2 U-boat simulation
Arianne is an engine to develop multiplayer online games like Stendhal
Enigma is a puzzle game
Zoomable user interface (ZUI) with file manager, file viewers and more
Android, UIQ 3.0, Series 60 Edition 5 open-source software
A generative art image evolver