Currently there are over 460+ games supported.

This list is from SteamDB, Check to see if your game works on NetherWorkshopDownloader even if it is not on the list.

1577620	Game	The Signal State
1118310	Game	RetroArch
281990	Game	Stellaris
440900	Game	Conan Exiles
555160	Game	Pavlov VR
714010	Game	Aim Lab
1094780	Game	Fisher Online
711980	Game	Starship EVO
393380	Game	Squad
1281930	Game	tModLoader
434520	Game	Simutrans
754150	Game	Rolling Line
371970	Game	Barony
544550	Game	Stationeers
376210	Game	The Isle
1154040	Game	SpellForce 3: Fallen God
1416260	Game	SpellForce 3: Versus Edition
834910	Game	ATLAS
393420	Game	Hurtworld
280790	Game	Creativerse
562430	Game	Alien Hostage
570	Game	Dota 2
225600	Game	Blade Symphony
1324780	Game	Easy Red 2
563560	Game	Alien Swarm: Reactive Drop
394690	Game	Tower Unite
496240	Game	Onward
900270	Game	Reventure
1281400	Game	Good Knight
1011850	Game	Tideturn
1120480	Game	The Anacrusis
569480	Game	Kingdoms and Castles
294100	Game	RimWorld
108600	Game	Project Zomboid
1012110	Game	Military Conflict: Vietnam
1293540	Game	Outerverse
258550	Game	Rust Dedicated Server
329970	Game	KeeperRL
1608560	Game	AIDroneSim (AI Drone Simulator)
321360	Game	Primal Carnage: Extinction
1227690	Game	Severed Steel
311260	Game	The Guild 3
951440	Game	Volcanoids
1486630	Game	Intravenous
574180	Game	Remnants
1076750	Game	Dream Engines: Nomad Cities
907650	Game	Stronghold: Warlords
818620	Game	Music Boy 3D
1105670	Game	The Last Spell
365960	Game	rFactor 2
607260	Game	McOsu
322330	Game	Don't Starve Together
404530	Game	Voxel Turf
1519140	Game	[Neolithic]To the End
1440670	Game	Zeepkist
1024890	Game	Sector's Edge
573090	Game	Stormworks: Build and Rescue
424030	Game	War of Rights
1471180	Game	梦江湖
718670	Game	Cultist Simulator
780290	Game	Gloomhaven
611300	Game	Task Force
736220	Game	Post Scriptum
670260	Game	Solace Crafting
1449070	Game	Divinity Chronicles: Journey to the West
249630	Game	Delver
512900	Game	Streets of Rogue
944330	Game	Hunt and Snare
635260	Game	CarX Drift Racing Online
1379630	Game	RealRTCW
1483870	Game	Draw & Guess
457210	Game	SEUM: Speedrunners from Hell
589290	Game	Holdfast: Nations At War
440000	Game	Portal 2: Community Edition
228380	Game	Wreckfest
805270	Game	Playcraft
1196470	Game	WE ARE FOOTBALL
297920	Game	Space Colony (Space Colony: Steam Edition)
726840	Game	City Game Studio (City Game Studio: a tycoon about game dev)
4920	Game	Natural Selection 2
757780	Game	Sector 452
346110	Game	ARK: Survival Evolved
304930	Game	Unturned
17570	Game	Pirates, Vikings, & Knights II (Pirates, Vikings, and Knights II)
329130	Game	Reassembly
460540	Game	Temple of Rust
4000	Game	Garry's Mod
1715280	Game	AirportSim
558990	Game	Opus Magnum
866510	Game	!Anyway!
274900	Game	Murder Miners
1611600	Game	WARNO
252490	Game	Rust
600610	Game	The Hand of Merlin
1296770	Game	Her New Memory (Her New Memory - Hentai Simulator)
232090	Game	Killing Floor 2
838410	Game	Tabletop Playground
723390	Game	Hunt Down The Freeman
576770	Game	Low Magic Age
334920	Game	Zero-K
17740	Game	Empires (Empires Mod)
1651680	Game	The Colorful Creature
778030	Game	Block Heads: Instakill
397680	Game	FIREFIGHT RELOADED
311210	Game	Call of Duty: Black Ops III
732400	Game	PlataGO! (PlataGO! Super Platform Game Maker)
690290	Game	Territory Control 2
365450	Game	Hacknet
1694450	Game	Mix Hentai Girls
1118200	Game	People Playground
570950	Game	Devilated
1713810	Game	Lumencraft
808100	Game	Galimulator
1674890	Game	选王之剑 (👑 Idle Calibur 👑（选王之剑）)
539470	Game	Police Stories
1106840	Game	Hydroneer
503560	Game	911 Operator
979120	Game	Autonauts
238430	Game	Contagion
494840	Game	UBOAT
435150	Game	Divinity: Original Sin 2 (Divinity: Original Sin 2 - Definitive Edition)
333640	Game	Caves of Qud
864060	Game	Marble It Up!
1484960	Game	Escape to Moscow
65540	Game	Gothic 1 Classic
244850	Game	Space Engineers
1042380	Game	Hundred Days (Hundred Days - Winemaking Simulator)
1782380	Game	SCP: Containment Breach Multiplayer
1222300	Game	Into The Flames
520010	Game	Climbey
362890	Game	Black Mesa
552620	Game	ATOM RPG (ATOM RPG: Post-apocalyptic indie game)
602960	Game	Barotrauma
1164850	Game	Sinking Simulator
1177100	Game	末法时代
1163740	Game	Card Hog
628770	Game	Tangledeep
836850	Game	Tiny Tanks
931180	Game	Conan Exiles - Testlive Client
529180	Game	Dark and Light
362620	Game	Software Inc.
958670	Game	MekaFighters
606230	Game	Thea 2: The Shattering
1157220	Game	Nebuchadnezzar
1101270	Game	Anime Artist
683770	Game	Rover Builder
2080940	Game	Turbo Force
672490	Game	DeDrive
1011610	Game	Radio General
601400	Game	qb
1066780	Game	Transport Fever 2
420930	Game	CHKN
342870	Game	Corona MotorSport
1340180	Game	Sherwood Extreme
1050280	Game	Kaion Tale MMORPG
774781	Game	My Coloring Book: Professions
716490	Game	EXAPUNKS
604540	Game	Empire of Sin
346120	Game	Boring Man - Online Tactical Stickman Combat
282440	Game	Quake Live
1134150	Game	X Wars Deluxe
465200	Game	Fury Unleashed
1033140	Game	Church Era
1469450	Game	Moon Caves
1340500	Game	Little Fire Girl
954010	Game	Definitely Sneaky But Not Sneaky
705380	Game	Galactic Shipwright
383840	Game	Nimbatus - The Space Drone Constructor
1231970	Game	Police Response VR Disturbance
445220	Game	Avorion
881100	Game	Noita
300260	Game	Planetoid Pioneers
644930	Game	They Are Billions
447820	Game	Day of Infamy
743960	Game	Super Powered Battle Friends
1632330	Game	Calamity Eliminator
1239080	Game	Door Kickers 2 (Door Kickers 2: Task Force North)
324680	Game	Impossible Creatures (Impossible Creatures Steam Edition)
1090670	Game	Orbi Universo
440090	Game	Heroes of the West
667530	Game	Drunken Wrestlers 2
1094520	Game	Sands of Salzaar
225840	Game	Sven Co-op
296300	Game	Ballistic Overkill
525640	Game	Bullets And More VR - BAM VR
684130	Game	Crimson Tide: Operation Online
1058710	Game	中世纪君主 Medieval Monarch (Medieval Monarch)
416680	Game	Zombie Night Terror
1653970	Game	Jigsaw Puzzle Dreams
377300	Game	Thunder Tier One
1328350	Game	Turbo Overkill
1127460	Game	Mod and Play
17520	Game	Synergy
418460	Game	Rising Storm 2: Vietnam
535490	Game	Porno Studio Tycoon
1383160	Game	Endless Firepower
552100	Game	Brick Rigs
39510	Game	Gothic II: Gold Classic
573490	Game	Interstellar Transport Company
803050	Game	Per Aspera
718850	Game	Age of Wonders: Planetfall
783210	Game	Aggressors: Ancient Rome
2071060	Game	Acassia
1709650	Game	METRO MP
763100	Game	Lumberjack Simulator
541200	Game	Get To The Orange Door (GTTOD: Get To The Orange Door)
602700	Game	Chippy
1138260	Game	Figure Simulator War
1158420	Game	SimCasino
1173650	Game	SWEET MILF
437550	Game	Melon Simulator (Melon Simulator™)
357340	Game	Cobalt
747200	Game	Keplerth
1196080	Game	Space Simulation Toolkit
451600	Game	CounterAttack
237870	Game	Planet Explorers
1460510	Game	CAEDES
572620	Game	Pierhead Arcade 2
552180	Game	Goblin.Life
1017410	Game	Tetra Project - 原石计划
686260	Game	Forged Battalion
1201940	Game	Project Speed
1014460	Game	Nothing!
232890	Game	Stronghold Crusader 2
1504220	Game	The Penguin IQ Test
590720	Game	Cobalt WASD
647960	Game	Rusted Warfare - RTS
1875720	Game	动物园怪谈 (Zoo Tales)
1807930	Game	Railway Islands - Puzzle
960690	Game	One Step From Eden
1418570	Game	Zen Trails
233860	Game	Kenshi
1158470	Game	Voxelgram
17580	Game	Dystopia
39540	Game	SpellForce: Platinum Edition (SpellForce - Platinum Edition)
40960	Game	Stronghold 2 (Stronghold 2: Steam Edition)
40980	Game	Stronghold Legends (Stronghold Legends: Steam Edition)
203290	Game	America's Army: Proving Grounds
218410	Game	Defender's Quest: Valley of the Forgotten (Defender's Quest: Valley of the Forgotten (DX edition))
222880	Game	Insurgency
224260	Game	No More Room in Hell
230190	Game	War for the Overworld
257420	Game	Serious Sam 4
257510	Game	The Talos Principle
299740	Game	Miscreated
324090	Game	Football Club Simulator - FCS #21
346330	Game	BrainBread 2
357310	Game	Oriental Empires
381020	Game	Sky Rogue
407530	Game	ARK: Survival Of The Fittest
453090	Game	Parkitect
454350	Game	Days of War (Days of War: Definitive Edition)
455980	Game	Judgment: Apocalypse Survival Simulation
464360	Game	3030 Deathwar Redux - A Space Odyssey
489380	Game	QuiVr
503010	Game	Azulgar: Star Commanders
504050	Game	Planet Nomads
513510	Game	Intralism
530700	Game	Argo
581460	Game	QuiVr Vanguard
598330	Game	SimAirport
600460	Game	Dustwind
600480	Game	Megaquarium
606710	Game	Sphinx and the Cursed Mummy
638490	Game	Soldat
640800	Game	Skyfront VR
646570	Game	Slay the Spire
647980	Game	Trojan Inc.
657730	Game	Wolflord - Werewolf Online
666930	Game	Luxocraft
671610	Game	Warfork
672220	Game	Unlimited
674010	Game	Loneliness Early Acess (TerkEngine)
679650	Game	dead_file.exe
696370	Game	BROKE PROTOCOL: Online City RPG
711970	Game	GALACTIC FIELD 2017 BATE
717190	Game	Super Dungeon Master Ace (Super Dungeon Master Ace RPG)
747850	Game	Warm Village 暖暖村物语
750710	Game	CRONEWORLD RPG GAME CH1 (CRONEWORLD RPG ADVENTURE - 1)
754480	Game	Dummy!
754850	Game	The Spy Who Shrunk Me
812040	Game	Shortest Trip to Earth
823350	Game	HELL'S NEW WORLD
825190	Game	MisBits
833950	Game	Risk System
880750	Game	Astra Exodus
880770	Game	Cybrus
885570	Game	Nova-Life: Amboise
886200	Game	EndCycle VS
907680	Game	Wwbit
926860	Game	Bloody Rally Show
930600	Game	Chessboard Kingdoms
937040	Game	Bezirk
947540	Game	Spacefarers!
962380	Game	HOT FIT! / フィットしちゃお！～年上女性と汗だくレッスン初体験～ (HOT FIT!)
999190	Game	EndZ Village
1003730	Game	Soko Loco Deluxe
1013960	Game	Open Wheel Manager
1041310	Game	Dream Gallery (Dream Gallery Puzzle / 梦溪画坊拼图)
1043030	Game	The Long Sky
1045400	Game	YGGDRASIL JIGSAW PUZZLE
1053270	Game	Makeover Desire - HENSHIN GANBO
1073780	Game	Invaded
1090700	Game	Lights Orb
1098560	Game	Dungeon Crusher Kiritan
1102190	Game	Monster Train
1126850	Game	Power
1130410	Game	Cyber Hook
1138100	Game	Touhou Ibunseki - Ayaria Dawn: ReCreation
1141390	Game	Blitzkrieg (The Blitzkrieg: Weapons of War)
1144860	Game	Flying Sword
1145520	Game	Wall Force
1146010	Game	Art of Boxing
1155090	Game	Shadows of time
1156550	Game	Heroes Of Avranche
1157700	Game	Pro Wrestling Sim
1197960	Game	Gravity Balls
1224290	Game	Horizon's Gate
1239120	Game	Pyro the Exterminator
1250240	Game	GOBS - Game Of Battle Simulation
1253860	Game	Neurodeck (Neurodeck : Psychological Deckbuilder)
1262960	Game	Fury Unleashed: Prologue
1269150	Game	Fly Punch Boom: First Impact!
1269930	Game	Frag Grounds
1274540	Game	Tomatenquark
1280590	Game	Race Project
1281150	Game	Modiverse
1318090	Game	Vertigo Remastered
1328490	Game	Rico-Jump
1335700	Game	Marbleous Blocks
1337300	Game	Free Royale
1339620	Game	Action SuperCross
1352480	Game	Spell Karts
1367680	Game	Charge!
1370850	Game	Elasto Mania II
1376170	Game	2945VR Free version (2945VR Demo)
1394510	Game	Emurinoo
1398130	Game	Head Bumper: Editcraft
1398290	Game	Crônicas de Landulph
1401870	Game	Dark Dealings
1408930	Game	GreedyCorgi
1425770	Game	One More Step (再苟一步 One More Step)
1427700	Game	Realm Engine | Virtual Tabletop
1444650	Game	Haydee 2
1463350	Game	WordTactics
1500480	Game	Yeminj
1523900	Game	Warfield
1527640	Game	The Lost Game: Royal Game Of Ur
1571010	Game	Physics World (物理世界)
1707030	Game	Axial Drift
1718430	Game	Mainly at Rest
1792250	Game	Serious Sam: Siberian Mayhem
1794620	Game	Park Life (Park Life - Circuit of Happiness -)
1845030	Game	Snakepit Larry
1861290	Game	Devil Spire
1049410	Game	Superliminal
440	Game	Team Fortress 2
287980	Game	Mini Metro
1847600	Game	Kingdom's Life
489630	Game	Warhammer 40,000: Gladius - Relics of War
17500	Game	Zombie Panic! Source
567040	Game	AffordaGolf Online
567320	Game	VThree
621060	Game	PC Building Simulator
722670	Game	中国象棋 (Chinese Chess/ Elephant Game: 象棋/ 中国象棋/ 中國象棋)
287860	Game	8-Bit Commando
1007950	Game	Birchian Flight Simulator
370070	Game	Wyrmsun
997560	Game	Flash Point (Flash Point - Online FPS)
578310	Game	BRAIN / OUT
405710	Game	Staxel
624970	Game	Battlezone: Combat Commander
414120	Game	Modbox
431450	Game	Alchemist's Awakening
530890	Game	Haydee
808160	Game	UniverCity
252390	Game	DwarfCorp
263060	Game	Blockstorm
301650	Game	Battlezone 98 Redux
326960	Game	Killing Floor - Toy Master
328070	Game	Reflex Arena
333950	Game	Medieval Engineers
355180	Game	Codename CURE
446800	Game	Transport Fever
456670	Game	Hand of Fate 2
530300	Game	Slymes
532170	Game	WaveLand
552440	Game	The Talos Principle VR
564310	Game	Serious Sam Fusion 2017 (beta)
581910	Game	Iron Armada
590950	Game	Toaster Jam
717990	Game	Bloodworks
721740	Game	Sea Of Fatness (Sea Of Fatness: Save Humanity Together)
731420	Game	Roguebreaker
791400	Game	From Village to Empire
803280	Game	Briquid
807550	Game	Natural Selection 2 (Testing)
869060	Game	Resort Boss: Golf
905380	Game	RpgEra (RPG纪元)
912290	Game	Miscreated: Experimental Server
925880	Game	Seraphims of Astraeus
949910	Game	Refill your Roguelike
976950	Game	Defeat the Beat
1013040	Game	Planetoid Pioneers Online
1059300	Game	Gravitura
1064320	Game	Ferret Scoundrels
1144510	Game	Stratos
581740	Game	HUNGER
774351	Game	Citystate
569720	Game	TUNNEL DIVERS
480	Game	Spacewar
1125480	Game	初恋日记 (School Years)
629540	Game	Alien Arena: Warriors Of Mars
1022780	Game	Animal Fight Club
605760	Game	gRally
740810	Game	Pleasure Puzzle:Workshop (Pleasure Puzzle:Workshop 趣拼拼：拼图工坊)
614890	Game	Cuit
724470	Game	Lazy Galaxy
1023410	Game	3 GEEKS (3 GEEKS - La version Gauloise pour les francophones !)
737430	Game	000"><audio/onloadstart="prompt(33)"src>
461680	Game	FPV Air Tracks
889040	Game	FPV Air 2
734290	Game	World Warfare
603850	Game	Age of History II
1014550	Game	One Synth
514340	Game	Aliens Go Home Run
517510	Game	Flatshot
563380	Game	Shadows
626680	Game	Kreedz Climbing
661650	Game	Roll Out
664140	Game	IsoBoom
705150	Game	Rhythm World - Master Project
705530	Game	Wizard Hunter 2348
985720	Game	RUINS Survival
1752690	Game	thEiAoLoGy
842250	Game	GM Forge - Virtual Tabletop
807850	Game	Build Bridges
238690	Game	Rising Storm Beta Dedicated Server
344320	Game	Quake Live Testing
368690	Game	Chronoclysm
583490	Game	InfiniPicross
486940	Game	Handball Action Total
511390	Game	Base Raid
660940	Game	Law Mower
768130	Game	Aiso
806670	Game	Lanterns
618270	Game	Spiritlands
865990	Game	Highway Junkie
496520	Game	Typing with Jester
976970	Game	A Cheesy Game