Proper

Velvet Assassin is a stealth game from Replay Studios published through Southpeak Games set in World War 2. You play a female assassin/spy who performs stealth missions behind enemy lines during the war. The game is very much like Thief and Splinter Cell, with only a special "morphine mode" to distinguish it, allowing you special moves and limited invisibility. Despite not being a big budget game, Velvet Assassin offers rare hardcore stealth gameplay in a unique setting for the genre with nice graphics and good controls.

The Maw is an action-adventure video game developed by independent developer Twisted Pixel Games. It was released on Xbox Live Arcade on January 21, 2009, and for Microsoft Windows on March 9, 2009. It became available via Steam on March 10, 2009. The game revolves around a blue alien by the name of Frank, and a purple blob named Maw, that he leads around the game world, feeding and evolving.

The game won the 2008 Audience Choice award at PAX10, and is currently a finalist at the Independent Games Festival 2009.

Faces of War is a 2006 world war 2 real time strategy game for the PC

Kane & Lynch is a run-of-the-mill third-person shooter with elements of squad gameplay, in the vein of Freedom Fighters - only with a more theatrical feel and lots of "mature" language.

Far Cry 2 is a mission-based, open-ended FPS set in a fictional african country on the verge of civil war. The story is not even remotely connected to the original Far Cry, so this game is more like a Boiling Point fan's dream come true. Who needs Trigens when angry mercs are everywhere ?

In Flock! you control a flying saucer and must drive scared animals to your mothership through obstacles and traps. The game also features a proper campaign for 2-player co-op and a map editor.
Like in Switchball and a couple other "cross-platform" titles, the framerate is capped to 30 fps.

Defense Grid is a 3D singleplayer tower defense game. You must construct defensive towers of various types on predetermined areas to get rid of incoming alien swarms before they reach your mainframe and run with its power cores.

Demigod is an RTS/RPG/Tournament Fighter hybrid developed by Gas Powered Games and published by Stardock. The game is almost entirely multiplayer based with singleplayer consisting of skirmishes and tournaments against AI opponents. Using "assassin" demigods, players are treated to a Diablo-esque RPG game with RTS elements, while using "general" characters results in an RTS game with RPG elements.

Zeno Clash is a first-person shooter/brawler developed by ACE Team. The game has an incredibly unique visual style and impressive graphics using the Source Engine from Valve. A PC exclusive, Zeno Clash controls and plays very smooth and is a must-play for fans of the genre.

Chronicles of Riddick: Assault on Dark Athena is the sequel to Chronicles of Riddick: Escape From Butcher Bay from Starbreeze Studios in association with Vin Diesel's Tigon Studios. The game includes the original Butcher Bay game with enhanced visuals to match the sequel. Gameplay focuses on first-person stealth, melee combat and shooting, along with a strong focus on story, dialogue and cinematic moments. One of the most overlooked shooters in recent years, Dark Athena deserves a purchase from all FPS fans.