Steam Keys:
Warhammer: Vermintide Dwarf Helmet DLC
Blockstorm
Ancient Planet
Crusaders of the Lost Idols - Elite Starter Pack
Awesomenauts Yogscast Pack - Coco Nebulon
Awesomenauts Yogscast Pack - Max Focus
Awesomenauts Yogscast Pack - Rocco
Awesomenauts Yogscast Pack - Skolldir
Awesomenauts Yogscast Pack - Ted McPain
NASCAR Heat 2 - October Jumbo Expansion
Train Valley
LostWinds
Chainsaw Warrior
Tales from Candlekeep: Tomb of Annihilation - Tales of Artus Cimber’s Explorer Pack
Tales from Candlekeep: Tomb of Annihilation - Dragonbait’s Dungeoneer Pack
Tales from Candlekeep: Tomb of Annihilation - Asharra’s Diplomat Pack
Tales from Candlekeep: Tomb of Annihilation - Birdsong’s Entertainer Pack
Gurgamoth
Painters Guild
War for the Overworld - Yogscast Worker Skin
Chime Sharp
Tiltagon
Caveblazers - Arena Mode DLC
Mimic Arena
Battlerite DLC: YogYog Bear Mount
Spectrum
Bezier
Bomb Defense
FreeCell Quest
Guns of Icarus Alliance
Guns of Icarus Alliance Yogscast 2017 Costume Pack
Guns of Icarus Alliance Soundtrack
Mirage: Arcane Warfare
All-Star Fruit Racing - Yogscast Car DLC
Battle Riders
Master Spy
Lion Quest
Figment Soundtrack
ClusterPuck 99
Chronology
F.E.X (Forced Evolution Experiment)
Intelligent Design: An Evolutionary Sandbox
SuperLuminauts
Dimension Jump
The Inner World
Zero Reflex: Black Eye Edition
Tempest: Pirate Action RPG
LiEat
Punch Club

Non Steam keys:
Guild Wars 2 Heroic Edition
Robocraft Jingle Jam Pack
Star Trek Online TOS Enterprise Bridge Officers Pack
Neverwinter Feywild Starter Pack
25% Off Guild Wars 2: Path of Fire
Blade & Soul Giveaway Pack

Things I will give away but would be sadder to part with than the others:
Sanctum 2
Aragami
Beholder

Things that I would trade instead of portal 2:
The Sexy Brutale

Maybe if you really wanted it and wanted nothing else:
Bioshock Infinite