Alien Swarm!

Zandronum is a multiplayer oriented port, based off Skulltag, for Doom and Doom II by id Software.

Dead Meets Lead is every bit and piece of what a challenging zombie-slaying action game should be. Enter the role of the 18th century commander who’s on a mission to obliterate evil, by fighting your way through the island of El Mirando. A mystic plague has consumed the inhabitants of this island and you’ll have to liberate their souls by sword, and travel deep into the island to find and stop the dark minds behind the cursed disease. You’ll have to act, think and move fast if you want to survive the horrors of these wicked parts of the world. And do not hope for any rescue or help, it’s all up to you and you alone! »

Digital Paint: Paintball 2 is a Paintball game that started out as a mod for quake 2 but then took on a life of its own as an open source fps game with a global player and clan management system.

Nightmare Creatures is a survival horror video game released for the PlayStation and PC in 1997, and Nintendo 64 in 1998 as a North America exclusive. It was developed by Kalisto Entertainment and published by Activision.

Jake2 is a Java 3D game engine. It is a port of the GPL’d Quake2 game engine from id Software. To use the Jake2 engine you need either the data files from the original game or from the demo version that is available for download from ftp://ftp.idsoftware.com .

Monday Night Combat (abbreviated MNC) is a class-based third person shooter game in which two teams are pitted against each other in a fictional combat setting similar to that of a tower defense and multiplayer online battle arena title. The competitors on each team are clones, and the goal is to destroy the other team's Moneyball, a stationary objective which houses the team's money, while protecting their own.

The Dead Linger is a sandbox zombie game, the world is randomly generated as you move in to it.

Xenowerk is a top-down action shooter challenging your combat skills in an underground science lab. Descend deeper into the abyss and explore the tarnished levels. Armed with a flashlight as your main guidance, you’ll never know what’s lurking in the dark!