I've been gone awhile. Fairly sure this list is correct, although I haven't checked it in detail in awhile.

.HACK/G.U. LAST RECODE
2Dark
60 Parsecs!
911 Operator
Aaero
Aarklash: Legacy
Absolver
Acceleration of SUGURI 2
Action Henk
AER Memories of Old
Age of Wonders II: The Wizard's Throne
Age of Wonders III
Amnesia™: Memories
Amnesia™: Memories
Among the Sleep - Enhanced Edition
Among the Sleep - Enhanced Edition
Ancestors Legacy
Anna's Quest
Anna's Quest
Arcanum: Of Steamworks and Magick Obscura
ARMA X: ANNIVERSARY EDITION
Ashes of the Singularity: Escalation
Ash of Gods: Redemption
Atari Vault
Automachef
Aviary Attorney
AWAY: Journey to the Unexpected
Batman: Arkham Origins
Battle Chef Brigade Deluxe
Battlestar Galactica Deadlock
Beat Cop
Beholder
Beholder 2
Beyond Eyes
BioShock: The Collection
BlazBlue: Continuum Shift Extend
Bleed 2
Blood Bowl: Chaos Edition
Book of Demons
Brawlout
Broken Sword 5: The Serpents Curse
Brothers: A Tale of Two Sons
Bulb Boy
Call of Duty®: WWII - Call of Duty Endowment Bravery Pack
Call of Duty®: WWII - Call of Duty Endowment Fear Not Pack
Capitalism 2
Caravan
Carcassonne - Tiles & Tactics
Carrier Command: Gaea Mission
Civilization VI: Platinum Edition
Cook, Serve, Delicious!
Crazy Taxi
Creature Romances: Kokonoe Kokoro
Crusader Kings II: Legacy of Rome
Crusader Kings II: Sunset Invasion
Crusader Kings II: Sword of Islam
Crusader Kings II: The Old Gods
Crusader Kings II: The Old Gods DLC
Crusader Kings II: The Republic
Cyberdimension Neptunia: 4 Goddesses Online - Deluxe Pack DLC
Darkest Hour: A Hearts of Iron Game
Darkwood
Deadbeat Heroes
Dead Island Definitive Edition
Dead Man's Draw
Dear Esther: Landmark Edition
Death's Gambit
Deponia: The Complete Journey
Deponia Doomsday
Desert Child
Destiny 2 Planet of Peace Exclusive Emblem
Devil Daggers
Dex
Dirt4 Team Booster Pack
DiRT Rally 2.0
Dog Sled Saga
Do Not Feed the Monkeys
Double Fine Adventure
DreadOut
Dream Daddy: A Dad Dating Simulator
Duke Nukem Forever
Duke Nukem Forever Hail to the Icons
Duke Nukem Forever The Doctor Who Cloned Me
Dungeon of the Endless
Dungeons 2
Dungeons 3
Dustforce DX
EARTH DEFENSE FORCE 4.1: Volatile Napalm
Empire: Total War - Definitive Edition
Empire: Total War Collection
Endless Legend - Tempest DLC
Endless Space - Collection
ENSLAVED™: Odyssey to the West™ Premium Edition
Europa Universalis IV
Fairy Fencer F
Fairy Tale About Father Frost
Fault milestone one
Fight'N Rage
Figment
Figment
Flashing Lights - Police Fire EMS
Forged Battalion
Fortune-499
Full Metal Furies
Full Throttle Remastered
Gas Guzzlers Extreme
GAUGE
Geometry Wars 3: Dimensions Evolved
Getting Over It with Bennett Foddy
God’s Trigger
Goetia
Gone Home + Original Soundtrack
GoNNER
Gremlins, Inc.
GRID 2
GRID Autosport
GRIP: Combat Racing
GRIS
Halcyon 6: Lightspeed Edition
Hard Reset Redux
Headlander
Highway Blossoms
HIVESWAP: Act 1
Holy Potatoes! We're in Space?!
Homeworld Remastered Collection
Hotline Miami
Hover
How to Survive 2
Human: Fall Flat
HunieCam Studio
Hyperdimension Neptunia Re;Birth1
Hyperdimension Neptunia Re;Birth1 Colosseum + Characters DLC
Hyperdimension Neptunia Re;Birth1 Deluxe Edition Bundle DLC
Hyperdimension Neptunia Re;Birth2
Hyperdimension Neptunia Re;Birth2 Deluxe Edition Bundle DLC
Hyperdimension Neptunia U: Action Unleashed
Icewind Dale: Enhanced Edition
Immortal Planet
Immortal Redneck
Imperator: Rome
Impulsion
INJUSTICE 2 LEGENDARY EDITION
Injustice Gods Among Us Ultimate Edition
INK Deluxe Edition
Internet Cafe Simulator
Interplanetary: Enhanced Edition
Iron Harvest
Jalopy
Just Deserts
KARAKARA
Katamari Damacy Reroll
Kathy Rain
Ken Follett's The Pillars of the Earth
Kerbal Space Program
Killing Floor
Killing Floor Incursion
Knock-knock
Lara Croft GO
Last Day of June
Last Word
Layers of Fear
LEGO® Batman™: The Videogame
Leisure Suit Larry - Wet Dreams Don't Dry
Lethal League Blaze
Little Nightmares
Lust for Darkness
Mad Games Tycoon
Magicka
Magicka 2
Mana Spark
Meadow
Medieval II: Total War - Definitive Edition
Medieval Kingdom Wars
Medieval Kingdom Wars
Megadimension Neptunia VIIR
Megadimension Neptunia VIIR - Deluxe Bundle DLC
Mega Man Legacy Collection
Mega Man X Legacy Collection
Memoria
Memoria Soundtrack
Mercenary Kings: Reloaded Edition
METAL SLUG X
Middle-earth: Shadow of Mordor Game of the Year Edition
Momodora: Reverie Under The Moonlight
Monster Prom
Moon Hunters
Mortal Kombat 11
Mount & Blade: With Fire & Sword
MXGP - The Official Motocross Videogame
Mysterium - Hidden Signs
Mysterium - Secrets & Lies
Mysterium: A Psychic Clue Game
NeuroVoider
Octahedron: Transfixed Edition
Oddworld: New 'n' Tasty
Of Orcs and Men
Old Man's Journey
Old School Musical
One Finger Death Punch 2
Operation Flashpoint: Dragon Rising
Opus Magnum
Orwell: Keeping an Eye on You
Outcast - Second Contact
Outcast - Second Contact
Overfall
Overgrowth
Overload
Oxenfree
PAC-MAN Championship Edition DX
Panzer Corps
Panzer Corps Allied Corps DLC
Party Hard
Party Hard 2
Patchwork
PAYDAY 2
PAYDAY 2 Bonus
Pillars of Eternity
Planet Coaster + World's Fair Pack DLC
Portal Knights
Potion Explosion
Poöf
Project CARS 2 + Japanese Cars Bonus Pack
Psychonauts
Punch Club
Purrfect Date - Visual Novel/Dating Simulator
Puss!
Raiden V: Director's Cut
Rain of Reflections: Chapter 1
Rampage Knights
Rapture Rejects
Rapture Rejects - Humble Exclusive "Safari Outfit" DLC
Red Faction Guerrilla Re-Mars-tered
Red Orchestra 2: Heroes of Stalingrad with Rising Storm
Redout: Enhanced Edition
Regions of Ruin
RESIDENT EVIL 2 - All In-game Rewards Unlock
Resident Evil Revelations
RiME
Rise & Shine
Rising Storm 2: Vietnam + 2 DLCs
River City Ransom: Underground
Road 96
Road Redemption
Running with Rifles
S.W.I.N.E. HD Remaster
Safety First!
Savage Lands
Scribblenauts Unlimited
Sega Bass Fishing and Eastside Hockey Manager
Seven: Enhanced Edition
Seven: The Days Long Gone
Shadowrun: Hong Kong - Extended Edition
Shadowrun Returns
Shenmue I & II
Shenmue I & II
She Remembered Caterpillars
Sherlock Holmes: The Devil's Daughter
Shiness: The Lightning Kingdom
Shiness: The Lightning Kingdom
Shoppe Keep 2
Shuyan Saga
Sid Meier's Civilization VI
Sid Meier's Civilization® III: Complete
Sid Meiers Pirates!
Silence
SIMULACRA 1 & 2
Sins of a Solar Empire: Trinity
Skullgirls
Slipstream
Small World 2
Smoke and Sacrifice
Snake Pass
Sniper: Ghost Warrior 2 Collector's Edition
Sniper: Ghost Warrior Gold Edition
Sniper: Ghost Warrior Trilogy
Sniper Ghost Warrior 2: World Hunter Pack
Sonic Adventure 2
Sonic Adventure DX
Sorcerer King: Rivals
SoulCalibur VI
SoulCalibur VI
Space Hulk Ascension
Space Quest™ Collection
Spec Ops: The Line
SpeedRunners
Splasher
Splendor
Splendor: The Cities DLC
Splendor: The Strongholds DLC
Splendor: The Trading Posts DLC
Stealth Inc 2: A Game of Clones
Stick Fight: The Game
Stikbold! A Dodgeball Adventure
Streets of Red
STRIDER™
Strikers Edge
Stronghold Legends: Steam Edition
Styx: Master of Shadows
Subsurface Circular
Sudden Strike 4
Super Daryl Deluxe
Super Mega Baseball: Extra Innings
System Shock: Enhanced Edition
Take On Helicopters
Take on Mars
Tales of Vesperia™: Definitive Edition
Talisman - The Frostmarch Expansion
Talisman - The Sacred Pool Expansion
Talisman: Digital Edition
Tangledeep
Tannenberg
TEKKEN 7
Tesla Effect: A Tex Murphy Adventure
The Corporate Machine
The Darkness 2
The Dwarves
The Final Station
The First Tree
The Last Leviathan
The Night of the Rabbit
The Political Machine 2016
There Came an Echo
The Sexy Brutale
The Technomancer
The Town of Light
The Walking Dead
The Walking Dead: 400 Days
The Walking Dead: Michonne - A Telltale Miniseries
The Warlock of Firetop Mountain
The Way
This is the police 2
This War of Mine
Tooth and Tail
Torchlight
Torchlight II
Townsmen - A Kingdom Rebuilt
Toybox Turbos
Treadnauts
Tricky Towers
Trillion: God of Destruction
Tumblestone
Twilight Struggle
Tyranny - Standard Edition
V-Rally 4
Verdun
Warhammer 40,000: Dawn of War III
Warhammer 40,000: Mechanicus
Warhammer 40,000: Sanctus Reach
Warhammer 40,000: Space Marine Collection
Warhammer: End Times - Vermintide
Warhammer® 40,000: Dawn of War® - Game of the Year Edition
Where the Water Tastes Like Wine
Wings of Vi
Worms Clan Wars
WRC 7 FIA World Rally Championship
Wuppo
XCOM: ULTIMATE COLLECTION
Yakuza Kiwami 2
Zombie Night Terror

"Non-Steam Unity Assets"
Inventory Pro
FlowCanvas
UFPS: Ultimate FPS
Realistic Effects Pack 4
Ultimate Game Music Collection

Uplay

Tom Clancy's The Division™
Tom Clancy's The Division™ - Survival