quake

classic gothic/horror-themed first person shooter

Quake is a classic first-person shooter game by id Software, released in 1996. This package contains a launcher script and menu entry to play Quake with any suitable engine.

quake2

classic science-fiction-themed first person shooter

Quake II is a classic first-person shooter game by id Software, released in 1997. This package contains a launcher script and menu entry to play Quake II with any suitable engine.
3D first-person shooter game

sauerbraten

3D first-person shooter game

Sauerbraten is a networked 3D first-person shooter game. It supports modern graphic effects and conveys a sense of fast-paced oldschool gameplay.
cool game where you pop out the bubbles!

frozen-bubble

cool game where you pop out the bubbles!

Frozen-Bubble is a clone of the popular "Puzzle Bobble" game, in which you attempt to shoot bubbles into groups of the same color to cause them to pop.
Free Lemmings(TM) clone

pingus

Free Lemmings(TM) clone

Pingus is a free clone of the popular Lemmings game.
Z-Buffer Maker

sludge-devkit

Development tools for creating SLUDGE adventure games

SLUDGE is an open source adventure game engine. It combines a scripting language with IDE tools.