The third installment of Half-Life 2, and the second episodic add-on to HL2's story, Episode 2 takes place where Episode 1 left off, and on the way manages to add in some neat new features and technical upgrades.

A literal prequel to Quake 2 and Quake 4, and a spiritual successor to Wolfenstein: Enemy Territory, "Enemy Territory: Quake Wars" is a team-and-class-based first person shooter.

GameTap is an online gaming service provided by TBS with a huge range of games available for only $60 a year. That fee gets you unlimited access to over 1000 games of many different varieties.

A turn-based strategy game similar to X-Com or other games of that sort, "Jagged Alliance 2 Gold" (re-released 2004) puts the player in control of a band of mercenaries to liberate an island nation from its oppressive queen.

Considered one of the most well-written games of all time by most reviewers, Planescape: Torment is now available for download through GameTap. With this, it is possible for people on newer computers to run this old, but beloved, game.

The fourth entry in Sid Meier's globe-and-history-spanning empire-building simulation game, Civilization IV is the latest refinement of the Civilization formula. Rather than introducing a lot of new features, Civilization IV tends to stick with the tried-and-true aspects of the series.

A sim game set on an alien space station, StarTopia also has a great Douglas-Adams style sense of humor.

The sequel to the tourist resort management sim, "Tropico 2" takes the concept of running a tropical island and then goes back a few hundred years to when said islands were under the control of brutal, ruthless pirates.

An intriguing psychic-based game by Free Radical, Second Sight is difficult to categorize; it's a third-person stealth action adventure game. It's got a lot of interesting design elements and choices and has a pretty good mix of action and stealth.

An adaptation of the comic of the same name, "Rogue Trooper" takes the futuristic setting and characters of the comic world and transfers them into a playable form.