I play user content for Doom and Doom 2, Doom 3, Quake 2, Return to castle Wolfenstein, Blood and sometimes for other games. Sure, I own all original games in Steam.

Log:
Megawads: 1 Monster Megawad, 3 Heures d'agonie 2, Alien Vendetta, Back to Saturn X E1: Get Out Of My Stations, Back to Saturn X E2: Tower in the Fountain of Sparks, Base Ganymede: Complete, Congestion: 1024, Congestion: 64, Demonfear, Doom 2 In Name Only, Doom 2 the Way id Did, Doom the Way id Did, Eviternity, Extremal Doom, Hell Revealed, Hellbound, Interception, Invasion UAC part 5, MARSWAR, MAYhem 2048 AKA MAYhem2014, Memento Mori, Memento Mori 2, PERDITION'S GATE, Plutonia 2, Requiem, Resurgence, Scimitar, Scythe, Scythe 2, Simplicity - Because Complexity Sucks, Speed Of Doom, Survive In Hell, The Ultimate NMD, The Vilecore, Unholy Realm, ZBloodpack, Epic 2, Auger Zenith, Akeldama, Shrine of the Silver Cyberprimate.

Wads: Alkylation, cannonball's speedy episode 1 wad, Caronte, Favillesco Alpha Episode: Apostasy on Amalthe, Knee Deep in Phobos, Mordeth, OSIRIS, Riot Control, The Complete RAVEN SERIES, The Darkening Episode 2, The Red Line, Titan, Vanguard, Grid 32, Beta Labs, Bloody steel, Realm Of Demonology, Alpha Accident: Terra Nova, 32 Inch Nails, Baker's Dozen, END POINT, Epic, Hell Ground, Hellfire, Hellfire 2, Hellfire Dreams, RDC Speedmappings 8-13 15 17-19, RDC Freakmappings 1-7.

Miniwads: 4000 Monsters, A lost soul, A Pretty Hard and KICK-ASS Level, Altar of Evil, At Warehouse Station, Barons o' fun, Cybie Our Friend, Dark Star, Decade, Diabolus Ex, Doom: The Parody, EMPIRE SERIES, For Whom The Bell Tolls, Galaxia, Gallery - The Art of Maligormax, GROVE, HeDRoX, HeDRoX 2, Hell 77 N°01, INVASION... Level 2--The Upper Decks, Judgement, MAINANTANCE COMPLEX, Miscellaneous Mayhem, Painful Evil, Primary Excavation Site, PUNISHER, Red Planet's Temple, Redux E2M4, Ruma., Soldier of Fortune, Still Kickin', Suicide, The Corrupt Priest, The Spire, Tremor: Part I - Genesis, Tunnel Run, Umbra of Fate, XMAS DOOM '99, X-treme, Yesterday's Nightmare, Blood Fire Death (Heretic), Time of Sorrow, TEMPLE OF SPIDER, Infested Outpost, Hellish Lab of Barons, Forevermore, Void And Rainbow, Horizon in the Middle of Nowhere, Time Parallax - Fiery Rooster Arena, Castle of the Far Island, Frozen Time, Downhell, The Inquisitor, The Inquisitor 2, Comatose, Doxylamine Moon: Overdose, 5till L1 Complex, Urotsuki: Inferno Road, Urotsuki: Radical Way, Urotsuki: Dead End, Urotsuki 2: Cargo Cult, UAC Secret, Back to square one, Controlled System, Gordia, Toilet Break, Gredna, Horalky, Mega Tear, Maihama, Kentucky Fried Wad.

Campaigns: Phobos (In Progress), Hell Island, In Hell, Phobos Anomaly. Deimos Panic, Fallen Angel, Nightmare, Orbital Collapse, New Star, Classic Doom, Teh Base, Event Horizon XV.
Experimental mods: Z-Hunter, X-mass, Reborn, Zombie Slayer, Phantasm,
Damnatio Memoriae (Episode II: Creatio Anulo), Fragging free (In Progress).

Addons: Zaero, Juggernaut: The New Story for Quake II (rip version), Unseen, Loki's Missions - Escape, Slight Mechanical Destruction, Breakout, Slaughtership.
Maps: Arkanian, The Abadonded City, Alcatraz (The Rock), The Azure Mine, Ballistic, The Boat in God’s Fly, Quad Hunt, Bullet Ballet, Big Gun Coolant Plant (Water Works), Crater’s Edge, Danger Room, Chemical Plant, Death Is Not Worth Trying, Devilish, Destructive Powers, The Darksun Portal, Earth Embassy, Angron Installation, Annihilation, Castle Antrax, Arctic Base, Abort. Retry. Ignore. Fail., Advanced Weapons Facility 1, Bens Liar, Borax II, Tombstones of Id Software, 5fiffy(1-3), CryptR's Outpost.

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Quake: Q!Zone
Blood: Banzai's Addon, French Meat, The Cult.
Return to castle Wolfenstein mappacks: Alone at War, Ameland, A night at the Opera, Brabant, Clonewar 2044, Clonewar Village, Enigma (1-2), Hidden Wolf, Hindenburg, Hotalk, Kriegsmarine Depot Phase 1, Operation Evil Eye, Phm's headquarters, Operation Redmoon (1-2), OPERATION STUTZE, Metro! (1-3), Operation Vorsichtig.
Duke Nukem 3D Duke Extreme, Duke Zone II.
F.E.A.R mods: Brutal Force, Dead Phantom.
Serious Sam mods: Mobios: The Last Planet, Bastion of Darkness, Mummy.

Far Cry mods: Rambo
Painkiller mods: Supernatural

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+ lot of other forgotten|unnamed|unidentified|not_worth_listing|etc stuff...