AssaultCube
First-person-shooter set in a realistic looking environment. It’s all about team oriented multiplayer fun.
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&mdash 1 so far
 
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Bug Defender
Buy weapons and ammo and set them up along a path to kill bugs before they get in your house. More kills means more cash for weapons upgrades.
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Marathon
First-person shooter originally developed by Bungie is now open source with active support.
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&mdash 3 so far
 
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Nexuiz
3D death match similar to Quake III: Arena. A 273 MB download — need we say more?
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OpenArena
Completely free game based on the Q3A engine and gamecode with fully working bots, net play and a vast sellection of maps and player models. You do not need Quake III Arena to play this game.
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OpenLieroX
An addictive realtime worms shoot-em-up backed by an active gamers community. Players choose their weapons, grab a ninja rope and face off for a deathmatch in a closed level.
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plobb
Candy graphics and a fun story combine in this bubble-poppin’ Asteroids-style game.
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Sanctioned Renegades
Multi-player first-person shooter has you and teammates going on missions against enemy combatants. Play in your web browser or download a standalone app for your Mac. The game — with no strings attached — is designed to push the limits of browser-based gaming technology.
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&mdash 1 so far
 
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Sauerbraten
First-person shooter with gorgeous graphics based on an open source game engine.
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&mdash 2 so far
 
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Scorched3D
Tanks battle it out in this modern version of the old DOS game, Scorched Earth. Up to 24 players can play at the same time in a variety of changing environmental conditions and terrains.
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Ski Challenge
Ski some of the great courses of the world such as Whistler, Lauberhorn, Streif or Saslong. Compete with friends over the Internet.
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UFO: Alien Invasion
Protect Earth from an alien invasion by controlling your base, training your troops and researching deadly, new weapons. Similar to X-COM, but with new features added.
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&mdash 1 so far
 
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Warsow
Standalone first-person shooter based on the Qfusion 3D engine (a modification of the Quake 2 GPL engine), aimed at competition. Developed “by gamers for gamers” with a focus on movement, speed and tricks when playing.
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