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Alien Dominion is an arcadey space shooter from defunct Black Fire Games

Tron 2.0 was developed by Monolith Productions. This is a FPS that is designed as a continuation of the movie Tron. Players can use a variety of weapons including the famous identity disc from the movie. Points can be earned which allow players to upgrade and customize their character's abilities. Light cycle racing is available in singleplayer and multiplayer modes.

Studio Mektek has released a free version of Mechwarrior 4. http://www.mektek.net/projects/mw4/ This was done fully in conjunction with Microsoft and Smith & Tinker.

Counter-Strike is a tactical multiplayer FPS from Valve Software. Originally designed by a fan as a Half-Life mod, Valve eventually released version 1.6 as a standalone commercial product through a licensing deal. This version remains highly popular to this day.

Soldier of Fortune: Payback is the third installment of the Soldier of Fortune game series. Unlike the previous two Soldier of Fortune games, which were developed by Raven Software utilizing the Quake 2 and Quake 3 engines, Payback was developed by Cauldron HQ, developed with Cauldron's in-house CloakNT engine, used in their previous First Person Shooter game, Chaser.

The Battle for Wesnoth is a Free (Open Source), turn-based tactical strategy game with a high fantasy theme, featuring both single-player, and online/hotseat multiplayer combat. Fight a desperate battle to reclaim the throne of Wesnoth, or take hand in any number of other adventures..

Stand alone expansion pack for Sonic Team's internationally popular online RPG Phantasy Star Universe

Civilization is a legendary strategy game by the legendary game designer Sid Meier. You must guide a small tribe to grow and become a great empire in competition with as many as six other tribes. You must make decision that affect exploration, war, diplomacy, city growth, and the discovery of new technologies, the results of which will ultimately define your empire and what it is capable of achieving.

CivNet is the final incarnation of the original game, enhancing the GUI, adding digital redbook audio, FMVs, and, of course, multiplayer via a number of network types.

Braid is a platformer puzzle game, produced independently. Gameplay is centered on time manipulation - time can always be rewound or frozen, and throughout the game you gain new time shifting abilities which you must use to progress through the game.

Aliens Versus Predator is a first person shooter from Rebellion and 20th Century Fox, set in the universe created by the four Alien movies, but featuring an original story with a special guest star appearance of Predator - the interstellar trophy hunter in search of the most dangerous game. Aside from that, this game has no relation to the AvP movies which actually came out a few years later than this game. There are three characters - alien, marine, and predator.