Steam Keys:

[#]
//N.P.P.D. RUSH// - The milk of Ultraviolet
16bit Trader
1000 Amps
1Quest
3 Stars of Destiny
4 Elements
7th Guest & 11th Hour Bundle
99 Levels to Hell

[A]
A Bird Story
A New Beginning - Final Cut
A Valley Without Wind
A Valley Without Wind 1 and 2 Dual Pack
A.I.M. 2 Clan Wars
Abandoned
Aerena - Clash of Champions
Air Guardians
AirBuccaneers
Akane the Kunoichi
Alien Rage: Unlimited
All Zombies Must Die!: Scorepocalypse
Alpha Kimori™: Episode One
Amerzone: The Explorer's Legacy
And yet it moves
AR-K
Arkhelom 3D
Armed with Wings: Rearmed
Astray
Avencast: Rise of the Mage

[B]
Bad Mojo: Redux
Basketball Pro Management 2014
Battlepaths
Battleplan: American Civil War
Beatbuddy: Tale of the Guardians
Bejeweled 3
Belladonna
Bet On Soldier
Betrayer
Beyond Divinity
Bionic Dues
Blast Em!
Blinding Dark
Bloodsports.TV
Borealis
Breath of Death VII
Bret Airborne
Bridge Constructor
Broken Sword: Director's Cut
Broken Sword 2
Burnout Paradise: The Ultimate Box
Burn Zombie Burn!

[C]
Canyon Capers
Capsized
Captain Morgane and the Golden Turtle
Caveman Craig
ChargeShot
Circuits
Cities in Motion 2
Claustrophobia: The Downward Struggle
Clickr
Cloud Knights
Closure
Cobi Treasure Deluxe
Cold War
Coldfire Keep
Commando Jack
Company of Heroes
CO-OP : Decrypted
Crimsonland
Crowntakers
Crunch Time!
Crusader Kings II
C-RUSH
Cthulhu Saves the World
Cyberpunk 3776

[D]
Dark Shadows - Army of Evil
Darkest Hour: A Hearts of Iron Game
Data Hacker: Corruption
Data Hacker: Reboot
Daedalus - No Escape
Dead Bits
Dead Hungry Diner
Deadlight
Deadly 30
Deadly Premonition: The Director's Cut
Dead Space 2
Demonicon: The Dark Eye
Deponia
Depth Hunter 2: Deep Dive
Depth Hunter 2: Ocean Mysteries
Descent: Underground
Deus Ex - The Fall
Devils & Demons
Dinner Date
Disciples III: Reincarnation
Disillusions Manga Horror
Divine Divinity
Doc Clock: The Toasted Sandwich of Time
Doorways
Double Dragon: Neon
Dracula 2: The Last Sanctuary
Dracula 3: The Path of the Dragon
Dracula 4 and 5 - Special Steam Edition
Dracula: The Resurrection
Dragon Age: Origins
Duke Nukem 3D: Megaton Edition
Duke Nukem: Manhattan Project

[E]
Eets Munchies
Enola
Epigenesis
Eschalon: Book I
Eschalon: Book II
Etherlords
Etherlords II
Eufloria
Europa Universalis III Complete
eXperience 112

[F]
Fabula Mortis
Faerie Solitaire
Fairy Bloom Freesia
Fallen Enchantress: Legendary Heroes
Fall of the New Age Premium Edition
Famaze
F.E.A.R.
Fester Mudd: Curse of the Gold - Episode 1
Fieldrunners
Finding Teddy
FootLOL: Epic Fail League
Fortix 2
Fortune's Tavern - The Fantasy Tavern Simulator
Fortune's Tavern DLC: Invite the Dwarves to Dinner
Fortune's Tavern DLC: Play the Mayor: Become the Mayor of Fortune's City
Fotonica
Foul Play
Fractal
Frederic: Resurrection of Music
Frederic: Evil Strikes Back
Frozen Synapse

[G]
Galactic Civilizations II: Ultimate Edition
Gare Sapphire Mechs
Garshasp: Temple of the Dragon
Garshasp: The Monster Slayer
Gold Rush! Classic
Gorky 17
Gotham City Impostors: Professional Kit
Grapple
Great Permutator
Greed: Black Border
Guardians of Middle-earth
Guardians of Middle-earth: Smaug's Treasure
Guncraft
Gunpowder
GunWorld

[H]
Hare In The Hat
Hard Reset Extended Edition
Harvester
Hegemony Rome: The Rise of Caesar
Hero Siege
Hitman: Absolution
Hook
Hordelicious
Hostile Waters: Antaeus Rising
Hot Tin Roof Soundtrack
House of 1,000 Doors - Family Secrets
House of 1000 Doors: Palm of Zoroaster
Huntsman: The Orphanage - Halloween Edition
Hydrophobia: Prophecy

[I]
ibb & obb
Ignite
Incandescent
Incognito
Insecticide Ep. 1
Instinct
Into the Dark: Ultimate Trash Edition
Ionball 2: Ionstorm
Iron Grip: Warlord
Iron Grip: Warlord - Scorched Earth DLC
Ittle Dew
I, Zombie

[J]
Jack Lumber
Jet Racing Extreme

[K]
Karmaflow: The Rock Opera Videogame - Act I
Kidnapped
Kingdom Wars
Knights and Merchants
Knights of Pen & Paper +1 Edition
Krai Mira
Kraven Manor

[L]
Larva Mortus
Legends of Aethereus
Life is Hard
Lilly Looking Through
Little Racers STREET
Long Night
Loot Hero DX
Ludoku

[M]
Madballs in Babo: Invasion
Madballs in Babo: Invasion DLCs
Magicka
Magicka: Wizard Wars Exclusive Staff and Blade
Magicka Wizard Wars Paradox Playtpus Robe
Majestic Nights
Maker's Eden Soundtrack Edition
Mass Effect 2
Medal of Honor
Medieval II: Total War™
Megabyte Punch
Meltdown
Memories of a Vagabond
Mercenary Kings
Merchants of Kaidan
Metal Dead
Metrocide
Millie
Miner Wars Arena Special Edition
Montague's Mount
Motte Island
Mount & Blade
Mount & Blade: With Fire & Sword
Muffin Knight
Multimedia Fusion 2

[N]
Namariel Legends: Iron Lord Premium Edition
Natural Selection 2
NecroVision
NecroVision - Lost Company
Neocolonialism
Nightsky
Nihilumbra
No Time To Explain
Nosgoth - Warlord Founder's Pack
Nostradamus: The Last Prophecy
Not the Robots
Numba Deluxe

[O]
OASE - Other Age Second Encounter
Obulis
Ocean City Racing
Oddworld: Abe's Oddysee
Operation Flashpoint: Dragon Rising
Operation Flashpoint: Red River
Orborun
Outland - Special Edition
Overlord + Overlord Raising Hell
Overlord 2

[P]
Painkiller Redemption
Painkiller: Recurring Evil
Particle Mace
Party of Sin
Penguins Arena: Sedna's World
Pid
Pivvot
Pix the Cat
Pixel Puzzles: Japan
PixelJunk Monsters Ultimate
PixelJunk Shooter
Plain Sight
Planetary Annihilation
Polyball
Postal
Postal 2
Post Apocalyptic Mayhem
Post Apocalyptic Mayhem: DLC - Chaos Pack
Postmortem: One Must Die - Extended Cut
Potatoman Seeks the Troof
Prime World: Defenders
Project Aftermath
Project Night
Proteus
Psychonauts
Puzzle Agent

[Q]
Quarries of Scred
Q.U.B.E. Director’s Cut
Quest of Dungeons
QuestRun

[R]
Rabbit Hole 3D
Racer 8
Ravaged Zombie Apocalypse
Ravensword: Shadowlands
Read Only Memories
Red Bit Ninja
Reign: Conflict of Nations
Rescue: Everday Heroes (US Edition)
Residue: Final Cut
Restaurant Empire II
Return to Mysterious Island 2
rFactor
Rhiannon: Curse of the Four Branches
Rhythm Destruction
Ring Runner: Flight of the Sages
RIP - Trilogy
Robowars
Rocketbirds: Hardboiled Chicken
Roommates - Deluxe Edition
Rooms: The Main Building
Runes of Brennos
Runestone Keeper
Rush Bros
Rush for Glory

[S]
Sacraboar
Salammbô: Battle for Carthage
Sanctum 2
Sanctum: Collection
Satazius
Savant - Ascent
Schrödinger’s Cat And The Raiders Of The Lost Quark
Scourge: Outbreak
Scourge: Outbreak - Ambrosia Bundle
Scratches - Director's Cut (Removed Steam Game)
Serious Sam 3: BFE
Serious Sam HD: The First Encounter
Serious Sam HD: The Second Encounter
Shadow Puppeteer
Shadow Warrior Classic Redux
Shadows on the Vatican Act I: Greed
Shattered Haven
Shin Samurai Jazz
Shiny The Firefly
Sinking Island
Skara - The Blade Remains
Skara Starter Package
Skilltree Saga
Skyborn
Slip
Snuggle Truck
SOL: Exodus
Solar Flux
SoulCraft
Space Pirates and Zombies
Space Trader: Merchant Marine
SpaceChem
Sparkle 2 Evo
Spark Rising
Speedball 2 HD
Spirit of War
Spy Chameleon - RGB Agent
S.T.A.L.K.E.R.: Call of Pripyat
S.T.A.L.K.E.R.: Clear Sky
S.T.A.L.K.E.R.: Shadow of Chernobyl
StandPoint
Startopia
Stealth Bastard Deluxe
Steel & Steam: Episode 1
Steel Storm Burning Retribution + DLCs
Storm United
Stranded
Street Racing Syndicate
Sugar Cube: Bittersweet Factory
Super Cyborg
Super Distro
Super Killer Hornet: Resurrection
Super Motherload
Super Trench Attack 2
Survivalist
Survivor Squad
Swords & Crossbones: An Epic Pirate Story
Swords & Soldiers
SWR JST DX Selective Memory Erase Effect
Syberia
Syberia II
System Shock 2

[T]
Taimumari
Tales From Space: Mutant Blobs Attack
Tcheco in the Castle of Lucio
Teddy Floppy Ear - Kayaking
Teddy Floppy Ear - Mountain Adventure
Teddy Floppy Ear - The Race
Terraform
The 39 Steps
The Albino Hunter
The Book of Legends
The Bridge
The Cameron Files: The Secret at Loch Ness
The Campaign Series: Fall Weiss
The Chaos Engine
The Dream Machine Chapters 1-3
The Journey Down: Chapter One
The Last Door: The Collector's Edition
The Last Remnant
The Lord of the Rings Online: Steely Dawn Starter Pack
The Path
The Samaritan Paradox
The Ship
The Void
They Breathe
Thief Town
Tidalis
Timberman
Time Gentlemen Please! and Ben There Dan That!
Tiny & Big: Grandpa's Leftovers
TinyKeep
Tobe's Vertical Adventure
Total Pro Golf 3
Total War: ROME II - Caesar in Gaul (DLC)
To The Moon
Tower of Guns
Tower Wars
TownCraft
Trapped Dead: Lockdown
Trash TV
Trine 2: Complete Story
TRISTOY
Tropico 4: Steam Special Edition
Truffle Saga
Two Worlds II
Type:Rider

[U]
Urban Legends
US and THEM

[V]
Vangers
Vanguard Princess
Vertical Drop Heroes HD
Vertical Drop Heroes HD - Halloween DLC
Victim of Xen
Violett Remastered

[W]
Waking Mars
Warlocks vs Shadows
War of the Roses: Kingmaker
Warlock - Master of the Arcane
Whisper of a Rose
White Noise Online
Wizardry 6 & 7
Wooden Floor
Wrack OST
Wyv and Keep: The Temple of the Lost Idol

[X]
X-Blades
Xotic Complete (inc. 3 DLC)

[Y]
Yury

[Z]
Zack Zero
Zen Bound 2
Zombie Killtime
Zombie Solitaire
Zooloretto

Humble Bundle for Android 3 Bundle: (all games in one Steam Key)

World of Goo
Anomaly: Warzone Earth
Osmos
EDGE

Humble Indie Bundle #3 Bundle: (all games in one Steam Key)

And yet it moves
Atom Zombie Smasher
Cogs
Crayon Physics Deluxe
Hammerfight
Steel Storm: Burning Retribution
VVVVVV

Humble Weekly Sale: Nordic Games Bundle: (all games in one Steam Key)

Supreme Commander
Supreme Commander: Forged Alliance
The Guild II
Red Faction: Armageddon

Humble Borderlands Bundle: (all games in one Steam Key)

Borderlands
Borderlands DLC: The Zombie Island of Dr. Ned
Borderlands DLC: Mad Moxxi's Underdome Riot
Borderlands DLC: The Secret Armory of General Knoxx

Humble Borderlands Bundle BTA: (all games in one Steam Key)

Borderlands 2
Borderlands 2 DLC: Mechromancer Pack
Borderlands 2 DLC: Psycho Pack
Borderlands 2 DLC: Creature Slaughterdome

Origin Keys:

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

Desura Keys:

8-Bit Commando
12 Labours of Hercules
Airship Dragoon
Audio Venture
Beep
BlindSide
Bridge It
CAFE 0 - The Drowned Mermaid DELUXE
Chester
Cognition Episode 1: The Hangman
Crystal Story II
Damnation - City of Death (Alpha)
Dawning
Deep Eclipse
Doom & Destiny
Evy: Magic Spheres
Frederic – Resurrection of Music
Hunter's Trophy 2 - America
Loot Hero
Me and PostApocalypse 2: Scraping
Memories of a Vagabond
Metal Planet
Micy Roll
Millennium
Miner Warfare
Ocean City Racing
Oknytt
Oniken
Plith
Porradaria Upgrade
Rac and Ren
Realm Walk of Soul
Retention
Saturday Morning RPG
Siege Wars
Sinister City
Super Cyborg
Telepath RPG: Servants of God
The Fall Of Gods
The Girl and the Robot
Three Dead Zed
Tr-Zero
Unhack
Voyager
Words for Evil
Zombusters

Ubisoft UPlay:

Heroes of Might & Magic IV: Complete Edition
Might & Magic 1 to 6 Collection

Blizzard:

Heroes of the Storm (or Hearthstone?) EU Beta Key - just try if you like to trade :D