I have added a lot of games to my list, so I think I should list them this time. Sorry for the long post, I'll only bump this next time.

I can trade for the games I don't own on every platform listed below. I can also offer multiple games depending on the games you want.

Steam
6180 the moon
Afterfall InSanity
AirBuccaneers
Alpha Kimori
Anodyne
Aquaria
AVADON 2: THE CORRUPTION
Avernum: The Great Trials Trilogy
Awesomenauts
Babel Rising
Babel Rising - Sky's the limit
Battlepaths
BETRAYER
Beyond Divinity
blackwell Deception
Bloody Good Time
BOREALIS
cities in motion
Clash of Heroes I am The Boss DLC
Cognition Ep. 1
Company of Heroes Gold
Company of Heroes: Tales of Valor
Cortex Command
crusader kings 2
Culling of the Cows
Darwinia
DEAD HUNGRY DINER
Deadlight
Defcon
demigod
DEPTH HUNTER 2: DEEP DIVE
Dungeons: The Dark Lord
DUNGEONS: THE EYE OF DRACONUS
Dwarfs!?
Edna & Harvey: Harvey's New Eyes
Epigenesis
ELVEN LEGACY
Eschalon Book II
evil quest
Fish Fillets 2
FootLOL: Epic Fail League
Gemini Rue
Glüüms Temple Magicka DLC
GORKY 17
greed corp
GT Legends
Guacamelee! Gold Edition
Gun Monkeys
Hacker Evolution Duality
Hammerfight
Hard Reset Extended Edition
Home
Huntsman the Orphanage
Hydrophobia: Prophecy
ibomber defense
ichi
Insurgency
Intrusion 2
JAGGED ALLIANCE 2 - WILDFIRE
Killing Floor
Killing Floor Bundle
King's Bounty: Warriors of the North - Valhalla Edition
KNIGHTSHIFT
Kung Fu Strike Warriors Rise Master Level DLC
Kung-Fu Strike Warriors Rise
La Mulana
Little Inferno
Lone Survivor: The Director's Cut
Lucius
Lunar Flight
Mad Riders
Magicka
Magicka Vietnam
major mayhem
McPixel
Men of War: Assault Squad
Men of War: Assault Squad - DLC Pack
Mini Ninjas
Multiwinia
Nightsky
nosferatu
Nosgoth Veteran Pack
Oil Rush
Painkiller: Recurring Evil
Party of Sin
PAYDAY 2 - Lycanwulf and The One Below Masks
PixelJunk Monsters
Potatoman Seeks the Troof
Realms of the Haunting
Red Orchestra 2: Heroes of Stalingrad - GOTY
Red Orchestra: Ostfront 41-45
REPRISAL UNIVERSE
Robotex
Saira
Sam & Max: The Devil's Playhouse
Serious Sam Double D
Serious Sam HD: The First Encounter
Serious Sam HD: The Second Encounter
Sid Meier's Civilization III: Complete
Skyborn
Sol Survivor
Soulbringer
Space Pirates and Zombies
SpaceChem
Speedball 2 HD
Starvoid Preorder with bonus gift (will add 1 gift copy to your Steam inventory upon activation)
Super Sanctum TD
SURGEON SIMULATOR 2013
SWEET LILY DREAMS
Sword of the Stars II Enhanced Edition
Sword of the Stars: Complete Collection
Take On Helicopters
Tales of Maj’Eyal
Talisman Prologue
TEX MURPHY: MARTIAN MEMORANDUM
The 39 Steps
The Adventures of Shuggy
The Journey Down: Chapter 1
The Showdown Effect
Thief Gold
Thomas Was Alone
Tiny and Big in Grandpa's Leftovers
Titan Attacks
To the Moon
Total War: ROME II - Caesar in Gaul (DLC)
Toy Soldiers
Two Worlds 2
Vessel
Velvet Assassin
VOYAGE: JOURNEY TO THE MOON
Waking Mars
War of the Roses: Kingmaker
Warhammer 40,000: Dawn of War
Weird Worlds
Worms Blast
Worms Crazy Golf
Worms Pinball
XCOM: Enemy Unknown
ZEIT
Zeno Clash

Desura
8-bit Commando
AlterEgo: DreamWalker
Battlegroup
Bleed
Chester
Cognition Episode 1: The Hangman
Cognition Episode 2: The Wise Monkey
dungeons of dredmor
EvilQuest
fibrillation
Forceline
Gimbal
Humble Bundle 3
Humble Frozen Synapse Bundle
Humble Frozenbyte Bundle
INTROVERSION Complete Pack (4 games)
Livalink
Love+
Major Mayhem
Oniken
Paranormal
PORRADARIA UPGRADE
SANCTUARYRPG
weird worlds

Origin
Burnout Paradise: The Ultimate Box
Command & Conquer: Red Alert 3 - Uprising
Crysis 2 Maximum Edition
Dead Space
Dead Space 3
Mass Effect 2
Medal of Honor
Mirror's Edge
Populous

Uplay
Assassin's Creed® Brotherhood
Prince of Persia® The Forgotten Sands™

GOG
DUKE NUKEM 3D ATOMIC EDITION
The Witcher 2
TORCHLIGHT
LITTLE BIG ADVENTURE (RELENTLESS: TWINSEN'S ADVENTURE)

Traded with: koima57, Grargar, Momo1991, Giltonnam, gbaz69, undeadcow, bela555, swarmandal, pursang007, DProject, roygbiv309, Leucius, PandaLiang, SELF, IAmSinistar, Bigs, K_1269, Heretic777, JohnWalrus, ne_zavarj, DarkoD13, rpgamer381, Brainslide, Ian, muratogut, plunroi, cdnred, misfire200, carnival73, samlii, BuzzLightyear2, m0gb0y74, Barry_Woodward, abolat, stoicsentry, isis12, Darthprymus, shadowmirage, Tarun, dyscode, Rodzaju, Fictionvision, Fesin, Iain, VVhiteVVolf, Leroux, NameGoo, MrWFixit, the_bard, InF3Ktion, Whitewraith, eny4lios, Aidinthel, Getcomposted, Azrael360, amagarr, roelibex, Alterego1972, Ghorpm, Ingsoc85