s&box is a modern game engine, built on Valve's Source 2
A game engine with an emphasis on real-time cutting-edge solutions
A 2D scrolling platform shooter, inspired by Duke Nukem 1
3D-Accelerated open-source DOOM engine
EDGE is an advanced DOOM source port
A Java light, open source first person shooter,with editors.
Fast and robust map analyser for Brood War.
Xjig-2.5 is an X11 jigsaw puzzle
A 2D RPG written in Java and OpenGL