1701 AD
AirMech (is this still in Alpha?)
Alan Wake & American Nightmare
Alice: Madness returns
Alien Shooter
Alien Shooter 2 - Reloaded
Aliens versus Predator Classic 2000
Amnesia
And Yet It Moves
Aquaria
Arx Fatalis
Assassins Creed 1 & 2
Atari: 80 Classic Games in One! (Removed from Steam ages ago)
Audiosurf
Auditorium
Avadon: The Black Fortress
Avencast: Rise of the mage
Avernum 4-6
Babo - Invasion (do not run, behaves strange and stays active process)
Bards Tale 2004
Beat Hazard
Beyond Good & Evil
bit.trip beat
bit.trip runner
Blade Kitten
Blue Berry Garden
Borderlands
Braid
Brainpipe
Brink
Broken Sword 3 : Sleeping Dragon
Brothers in Arms : Earned in Blood
Brothers in Arms Road to Hill 30
Bully
Bunch of Heroes
Burn zombie burn
Burnout Paradise the Ultimate Box
C&C 3, 4 RA3 & Kanes Wrath
Call of Cthulhu
Capsized
Caster
Cave Story+
Ceville
Chains
Chime
Chrome
CivCity Rome
Civilization IV, Colonization*
Commandos – all games
Cossacks: European Wars
Costume Quest
Crazy Taxi
CreaVures
Critical Mass
Crysis
Crysis Warhead
Dark Messiah of Might and Magic
Darksiders II
Darkstar One
Darwinia
Dead Space 1&2
Dear Esther
Deathspank – all games (Thongs of Virtue, Baconing & Deathspank)
Defence grid
Delve deeper
Depths of Peril
Deus Ex GOTY
Deus Ex Human Revolution & Missing Link DLC
Deus Ex: Invisible War
Diamond Dan
Din's Curse
Disciples 2 Gold
Divinity 2 : Dragon Knight Saga
Doc Clock - The Toasted Sandwich of Time
Doom 3 & ROE Expansion
Dragon Age Ultimate Edition
Dreamfall: The Longest Journey
Duke Nukem Forever
Dungeon Siege 1&3
Dustforce
Dwarfs!?
E.y.e.: Divine Supremacy
Edge
Eets
Elder Scrolls Oblivion
Empire: Total War
Eschalon: Book 1
Eschalon: Book 2
Europa Universalis III - Complete
Eversion
Everyday Genius: SquareLogic (No longer on Steam. Should hopefully return, though.)
Fallout New Vegas
Fantasy Wars
Far Cry*
Fate of the world
Fear 1&2
FEAR 2
Floras Fruit Farm
Fortix
Fortix 2
Freedom Force
Freedom Force vs the 3rd Reich
Front Mission Evolved
FTL: Faster Than Light
Future Wars
Galactic Civilizations I Ultimate Edition
Geneforge I-V
Geometry Wars: Retro Evolved
Ghost Recon Advanced Warfighter
Ghost Recon Advanced Warfighter 2
Gish
Gothic
Gothic II
Gothic series (I, II, III, Forsaken Gods and ArcaniA)
Grand Theft Auto 3
Gravitron 2
Greed Corp
Greed: Black Border
Grid
Grotesque tactics
GTA Vice City
GTA: San Andreas
Gundeadligne
Gundemonium recollection
Gyromancer
Half-life 2 (+ep 1&2)
Half-Life games, all of them (surprise)
Hamilton's great adventure
Hammerfight
Hard Reset
Hero Academy
Hitman 2 & Blood Money
Hitogata Happa
Hydrophobia
Indiana Jones and the Fate of Atlantis
Indiana Jones and the Last Crusade
Infernal
ion assault
Jade Empire
Jagged Alliance 2 Gold
Jagged Alliance 2 Gold Unfinished Business
Jedi Knight (and Mysteries of the Sith), Jedi Outcast, Jedi Academy
Jolly Rover
Just Cause 2
Kaptain Brawe
King Arthur - The Role-playing Wargame
King's Bounty - The Legend
King's Bounty Armored Princess
King's Bounty Crossworlds
Knights of Honor
Koahn II
Kohan Ahrimans Gift
Kohan Immortal Sovereigns
KOTOR
Lara Croft and the guardian of light
Limbo
Loom
Mafia
Magic the Gathering 2012
Magicka
Mass Effect 1+2*
Max and the magic marker
Max Payne 1 & 2
Medieval II Total War
Metro 2033*
Mirror's edge*
Monkey Island 2
Morrowind
Mount&Blade
Mount&Blade: Warband*
Mr. Robot
Napoleon Total War
Necrovision
Neverwinter Nights 2*
New Star Soccer 5
Nexuiz
Nexus The Jupiter Incident
NightSky
Nikopol: Secrets of the Immortals
Obulis
Oddworld: Abes Exoddus
Oddworld: Abes Oddysee
Orcs Must Die!
Osmos
Painkiller Black Edition
Painkiller Overdose
Painkiller Resurrection
Penumbra (all of it)
Plants vs zombies
Poker Night at the Inventory
Port Royale 2
Portal 2
Post Apocalyptic Mayhem
Prince of Persia (2008) - launcher runs, game does not
Prince of Persia Two Thrones & Warrior Within
Project Snowblind
Prototype 2
Puzzle Agent
Puzzle Agent 2
RAGE
Railroad Tycoon 2: Platinum
Rainbow Six 3 Gold
Rainbow SIx Lockdown
Rainbow Six Vegas
Rainbow Six Vegas 2
Recettear
Red Faction Armageddon
Red Faction: Guerrilla
Renegade Ops
Return to Castle Wolfenstein
Rip Trilogy
Risen
Roboblitz
Rogue Trooper
Rochard
Rome Total War Alexander
Rome Total War Gold
Rune Classic
Runespell: Overture
rush
Sacred Gold
Saints Row 2*
Saints Row the Third
Sam & Max (all of them)
Sanctum
Scorgasm
Sequence
Serious Sam HD first and second encounter
Shank
Shatter
Shdowgrounds + S: Survivor
Sid Meier's Civilization III, but not the editors
Sid Meiers Civilization V
Sid Meiers Pirates
Sideways: New York
Sin 1 & 2
Skyrim
Sleeping Dogs
Sonic CD
sonic generations
Space Empires IV Deluxe
Space Giraffe
Space pirates and zombies
Spacechem
Spec Ops: The Line*
Spellforce 2 Gold Edition
Spellforce Platinum Edition
Splinter Cell
Splinter Cell - Double Agent
Splinter Cell Chaos Theory
Stacking
Stalker Clear Sky*
Stalker CoP & SoC
Star Wolves
Starscape
Sword and Sworcery
Sword of the Stars Complete Collection
Swords and Soldiers
Syberia
Syberia 2
Tales of Monkey Island Chapter 2 - 5
Terraria
The Baconing
The Ball
The Dig
The Guild 2: Rennaisance*
The Last Remnant
The Longest Journey
The Maw
The Secret of Monkey Island Special Edition
The Ship
The Void
The Void
The Witcher*
Thief : Dark Shadows
Titan Attacks
Titan Quest (+ IT)
Toki Tori
Tomb Raider: Anniversary
Tomb Raider: Legend
Tomb Raider: Underworld
Torchlight (but TorchEd works fine without Steam)
Torchlight 2
Total War Shogun 2
Trine
Trine 2
Tropico
Tropico 2
Tropico 3
Tropico 4
Twin Sector
Two Worlds II
Universe Sandbox
Uplink
Vampires the masquerade: Bloodlines
Velvet Assassin
Vessel
Warhammer 40k Dawn of War and Dawn of War 2 and all DLC / Expansions
Warlock: Master of the Arcane
Wasteland Angel*
Wolfenstein & RTCW
World of Goo
Worms Blast
X - Beyond the Frontier
X - Tension
X2 - The Threat
X3 - Albean Prelude
X3 - Reunion
X3 - Terran Conflict
X-COM: Interceptor and Enforcer
Xotic
Yosumin
Your doodles are bugged!
Zeno Clash
Zombie Driver
Zombie shooter 1+2