I find it funny how everyone says games aren’t on Linux. Not true, there are plenty of Indie games. Just almost no AAA games. Starting a list here of games that have native Linux installers. (Some may be *debs to make it even easier )
Games Already on Linux
Airline Tycoon Deluxe
Amnesia: The Dark Descent
Anvil of Thyrion (Hexen II)
Bandits: Phoenix Rising
Civilization: Call To Power
The Clockwork Man
The Clockwork Man 2: The Hidden World Ultimate Edition Game
Conquest of Elysium II
Creatures Internet Edition
D2X (Descent II)
Dark Horizons: Lore
Deadly Rooms of Death: Journey to Rooted Hold
Descent III – Mercenary Expansion Pack
Dirk Dashing: Secret Agent!
Disciples 2: Dark Prophecy
Dominions: Priests, Prophets & Pretenders
Dominions II: The Ascension Wars
Doom 3: Resurrection of Evil
Duke Nukem 3D: Atomic Edition
Enemy Territory: Quake Wars
Eric’s Ultimate Solitaire
FreeSpace: The Great War
FreeSpace: Silent Threat
Gratuitous Space Battles ( www.gratuitousspacebattles.com)
Heavy Gear 2
Heavy Metal: F.A.K.K.2
Heroes of Might and Magic III
Hyperspace Delivery Boy
Aliens versus Predator
Inherit the Earth: Quest for the Orb
Jagged Alliance 2
Knights and Merchants
Lugaru (Now Open Source)
Medal of Honor: Allied Assault
Myth II: Soulblighter
Neverwinter Nights: Hordes of The Underdark
Neverwinter Nights: Shadows of Undrentide
Nuts & Scrap
Yohoho! Puzzle Pirates
Quake: The Offering
Quake 2: Colossus
Quake 3: Arena
Quake 3: Team Arena
Railroad Tycoon II (Gold edition)
Raptor: Call of the Shadows
Reel Deal Slots
Robin Hood: The Legend of Sherwood
Return to Castle Wolfenstein
Rise of the Triad
Rune: Halls of Valhalla
Savage 2: A Tortured Soul
Serious Sam: The First Encounter
Serious Sam: The Second Encounter
Serious Sam 2
Shogo – Mobile Armor Division
Sid Meier’s Alpha Centauri
Sim City 3000 Unlimited
Small Rockets Backgammon
Small Rockets Mah Jongg
Small Rockets Poker
Soldier of Fortune
Super Meat Boy ( www.supermeatboy.com)
Tactical Ops: Assault on Terror
Tale in the Desert
Unreal: Return to Na Pali
Unreal Tournament 2003
Unreal Tournament 2003 Community Bonus Pack
Unreal Tournament 2003 Digital Extremes Bonus Pack
Unreal Tournament 2003 Epic Bonus Pack One
Unreal Tournament 2004
X2: The Threat
X3: Reunion Special Edition
Games that are pretty much confirmed for release on Linux
Age Of the Decadence
The Broken Hourglass (Still in active development)
Disciples 2: Dark Prophecy (LGP haven’t forgot about it).
Bandits: Phoenix Rising (LGP port)
Rail Adventures 3D
Postal 3 – Mature Content !
Natural Selection 2 (their engine supports it, but they are full of work now).
Escape from Quaoar
Achron (64-bit version available)
Eufloria (aka Dyson) (freeware version available now)
Oil Rush (RTS Game From The unigine developers).
Myth Franchise (Frank Earl will start porting soon)
Cortex Command (Frank Earl porting this one).
Garshasp (Porting under way).
Dark Salvation (porting on hold)
Rocketbirds (Flash based – they are working on it).
Angels Fall First : The Second Antarean War (Engine rewrite)
The Real Texas
Tiny & Big: Up That Mountain (Demo out now)
Veks (Alpha Available Now !)
Call of the Kings (aka Call of the Warlords 2, they are still alive, but the progress is slow).
Big Bulldozer (development on hold).
Poisonville (Status unknown)
Resistance Force (Alpha available now).
Joe-danger (According to this interview, the GNU/Linux build was already been made).
Fantasci: Hidden War
Underworld Hockey Club (beta available now)
Trauma (Flash based, so it should run on any OS).
Family Secrets: Ghosthunters
Tales from the Dragon Mountain: The Strix
Seasons (On Hold)
Iron Sky: Operation Highjump (being developed by Igios the porters of Shadowgrounds and SG:S).
Legie (GNU/Linux client is planned, when time permits).
Tiny and Big: Grandpa’s Leftovers
Caster 2 (Frank Earl will continue porting the sequel as well).
Dead Cyborg (GNU/Linux client coming soon)
Games that are still unconfirmed but have a chance of releasing on Linux
Syndicate-online (their engine supports it so there is still a chance).
AfterWorld (their engine supports it so there is still a chance).
Iron Grip: Warlord (There is the will, porters are being looked at).
Crown Of Power (Unconfirmed but everything is possible).
Serious Sam 2 (A beta client is available for years, but never worked for me).
World under siege (currently on hold till other projects are finished).
Subversion (highly likely but unconfirmed).
The Witcher 2 (“Well in case of W2 this is possible but it is definitely too soon to talk about this.”)
Final Fantasy XIV
Torchlight (single and mmo games are planned,using Ogre3D engine but Linux versions unconfirmed).
Hunted (also being developed by Deck13 using the Ogre3D engine)
Zombie RPG (IF they could port AoD then this should be no problem).
Soul Wars (They use TGEA and will try to port it to GNU/Linux).
Twilight Wars (Depends on Soul Wars porting ability).
Twilight Ages (Depends on Soul Wars porting ability).
Depths of Peril (porter found, in discussion).
Kivi’s Underworld (porter found, in discussion).
Din’s Curse (porter found, in discussion).
Bit.Trip.Runner ( bittripgame.com/bittrip-runner)
Chocolate Castle (www.lexaloffle.com)
Zen Puzzle Garden (www.lexaloffle.com)
Jasper’s Adventures (www.lexaloffle.com)
Oil Rush (oilrush-game.com)
World of Goo (worldofgoo.com)
I know there are others, please post along with links to the sites, and I will edit this post to add them.