C

Set in the far flung future (the 37th century to be precise), THQ is billing Supreme Commander as the 'next evolution in RTS'. Supreme Commander has widely been referred to as the spiritual successor to Total Annihilation.
The game is focused on using a giant bipedal mech called an Armored Command Unit (or ACU) to build a base, then upgrading units to reach higher technology tiers, and conquering opponents. The player can command one of three nations: the Aeon Illuminate, the Cybran Nation, or the United Earth Federation.

Lock On: Modern Air Combat or LOMAC, is a modern combat flight simulation developed by Eagle Dynamics and published by Ubisoft in Europe and 1C Company in Russia; it is considered as a survey simulator by its creators.

Doom II is the second game in the series, and it uses the same engine as the original. It introduced new monsters, a new weapon, and 32 new levels. It is also playable in GZDoom, and most of the information of Doom applies here too.

DOOM needs no introduction. It is the grandfather of the FPS genre as we know it. The GZDoom engine is a port of the originally DOS-based game that allows for high-res OpenGL graphics, mouselook, some widescreen support, among other things. GZDoom - http://grafzahl.drdteam.org/

Hexen: Beyond Heretic is a fantasy themed game, based on the play-style and premise of Doom.

Final Doom is a spinoff of Doom 2. It has the same weapons and monsters as Doom 2, but it has 64 fiendishly difficult levels. It is playable in GZDoom, and has the same flaw that Doom 2 does (not pictured)

First game in the series based on the Harry Potter movies, based on the popular book series.

ROSE Online, or Rush On Seven Episodes Online is a Massively Multiplayer Online Roleplaying Game (MMORPG) previously published by Korean company Gravity Corporation and developed by its subsidiary, Triggersoft. The game was originally pay to play, but Triggersoft stopped developing the game in 2007, and the rights of ROSE Online were sold to several different companies which now develop and publish their own free to play versions of the game. Gravity Interactive develops and publishes a version of the game known as naROSE for 3 North American and 40 European countries.

Descent 1&2 are DOS-era shooters from Parallax Software and Interplay, where you pilot an experimental fighter through a series of maze-like mines, fighting maverick robots and rescuing hostages.