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

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.

The long-awaited third FPS to pit Marines, Aliens and Predators against each other, and the second developed by Rebellion, the new AvP is a gamepad-friendly shooter for the cross-platform era. Jumping has been 'redefined', crouching is impossible but both Aliens and Preds have a vast array of gruesome, grand guignolesque fatalities and stealth kill moves to perform. It is also one of the first few games to boast DX11 effects and "official" Eyefinity support.

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.

X-Motor Racing is an indie racing sim with a focus on complex car physics. In addition to various play modes (hot lap, races against AI, dedicated server...) the game features widely customizable physics and an array of telemetric tools, and has been used by semi-pro racing teams as a cost-effective way to test and fine-tune real vehicle setups.

Avatar: The Game is a third-person shooter set a couple years before the movie on the same lush planet. As an RDA soldier, you'll first assist the colonial army but may eventually switch sides and "become" a tall tree-hugging Na'vi warrior. Mission objectives and "scanned" creatures will earn you experience points, and levelling up will upgrade the arsenal of weapons and techno/magical superpowers at your disposal.
Avatar supports both DX9 & DX10 and is compatible with a host of stereoscopic 3D display modes.

Clutch is a freeform racing and zombie-mowing game. Plays a lot like a gory budget mix of FlaOut, Crashday and Burnout Paradise... with zombies. This is also one of the very few games to natively support RuCap ultrasonic tracking devices.

World War II FPS shooter. Sequel to the original UberSoldier.

Dreamkiller is a FPS in the vein of Painkiller and NecroVisioN, with a plot remotely reminiscent of PsychoToxic (2005).
Psychologist Alice Drake has the unique ability to enter her patients' dreams and kick some nightmarish creatures' ass, be it using her tele- & pyrokinetic powers or any gun the troubled psyche can provide her with. Killing sprees cause Berserker Rage, during which Alice is superfast and enemies are easier to spot.