Neko

Kirby with headphones

Excellent Freeware List

A big list of free games. No free-to-play games, only purely free programs.

A MegaCollection

I have not necessarily played all of these games. ★ marks things I personally have played and recommend. Please let me know of anything else I could add in the comments at the bottom.

More games can be found under the kits.

Platformers

2D
Cave Story ★ (Cave Story Engine 2 Archive) (NXEngine-evo) The iconic one.
Ikachan ★ Underwater squid metroidvania from the creator of Cave Story.
La-Mulana (Archive) MSX-like platformer.
I Wanna Be The Guy Remastered ★ (Itch.io) (Original Site of IWBTG) The original masochist platformer, remade for modern systems.
Transformice (Steam) Semi-cooperative platformer MMO.
N Hyper-minimalist smooth platformer. There's also N++.
Open Surge Open source Sonic clone.
2D with Guns
Pink Heaven (Steam) ★ Demo of Kero Blaster with a different character.
Mibibli's Quest ★ (Steam) (Itch.io) (Game Jolt) Surreal Mega Man like platformer.
Iji Shooting platformer that changes based on your actions.
3D
Yo! Noid II: Enter the Void ★ (Itch.io) Pretty good 3D platformer.
[fr0g] clan official server 24/7 zk map (for stranger) Climbing downhill with FPS movement tech.
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Action

Top-down Shooters
Hyper Princess Pitch ★ Mad top-down shooter in the style of Smash T.V. Describes itself as "...sort of a remake of DOS Operation: Carnage..."
Princess Remedy In a World of Hurt ★ (Steam) Shooter RPG bullet hell thing about healing people. Has a paid sequel.
C-Dogs SDL ★ (Itch.io) SDL port of DOS freeware game C-Dogs. Has community-made levels.
Alien Swarm (Steam) Top-down squad shooter by Valve designers who were mooders. Also a release of SDK for Source.
Alien Swarm: Reactive Drop (Steam) Community-maintained version of the above.
The Ur-Quan Masters Free Stars: The Ur-Quan Masters (Steam) Port of Star Control 2 (3DO version) to modern systems.
BOOM Remake Remake of MacOS shareware game. Doom meets Bomberman.
Adventure
Veloren Open source voxel RPG inspired by Cube World and Breath of the Wild.
Minetest Open-source Minecraft clone.
Other
SuperTux SuperTuxKart Linux ond open-source mascot games.
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Arcade

Super Crate Box ★ (Steam) Hectic arcade platformer shooter where switching weapons gain points.
Ascii Patrol (Online) Moon Patrol inspired terminal game.
I MAED A GAM3 W1TH Z0MB1ES 1N IT!!!1 (Steam) ★ The 2009 Xbox Live Arcade classic returns. Great song.
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Strategy

Turn-based
The Battle for Wesnoth (Steam) Open source turn-based strategy game.
Unciv Open-source version of Civilization V.
Real-time
OpenRA (Itch.io) Open-source recreations of Red Alert, Command & Conquer, and Dune 2000.
Zero-K (Steam) RTS with 100+ units and terrain manipulation.
Warzone 2100 0 A.D. Widelands Open-source RTSes.
Beyond All Reason Maximalist RTS based on Total Annihilation.
openage Age of Empires styled open source RTS.
Other
Mindustry (Steam, paid) (Itch.io) Sandbox tower-defense game.
OpenTTD (Steam) Open-source transport management simulation game based on Transport Tycoon Deluxe.
Thrive Spore-like.

Also see Westwood's site in Classic.

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Classics

The Elder Scrolls: Arena The Elder Scrolls II: Daggerfall Wolfenstein: Enemy Territory (All Steam) Bethesda's old games. Guide for Enemy Territory on modern systems.
Westwood RTS Games Free downloads for some of the Command and Conquer games.
The Most Officialest SkiFree Home Page! Contains a version of SkiFree for modern systems, by the guy who made the original.
Marble Blast ★ Classic Mac game.
WinBolo Port of iconic Mac action strategy Bolo to Windows and Linux. Technically shareware.
Ares Central Antares Site about classic Mac space combat RTS, with a modern port.
Escape Velocity Hosts modern ports for the classic Mac space RPG, for both the original and some of its total conversion mods.
Myst Online: Uru Live Revival of Myst MMO Uru.
Boppin' Bizarre puzzle game. This version replaces all sounds with the original Amiga ones.
XBill Classic Linux game.
Windows 7 Games for Windows 11 and Windows 10 ★ Adds back the classic versions of Windows games.
cyber1 Preservation of PLATO/CYBIS/NovaNET era games.
Petz Installers yabiako Petz Universal Game Site Petz installers and resources.
Moriya Shrine Fansite with prepatched English versions of all the Touhou games. (Their guide)
Classic Gaming Arena Connect classic DOS games back online through DOSBox.
Also see some of the websites in Find More.
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RPG Maker

Tales of Game's Presents Chef Boyardee's Barkley, Shut Up & Jam: Gaiden, Chapter 1 of the Hoopz Barkley SaGa ★ The iconic and infamous basketball RPG Maker RPG. Sequel to both Barkley Shut Up and Jam! and Space Jam.
OFF ★ Alternate download (not Fandom, with additional links) ★ Famous old RPG Maker game.
Yume Nikki (Steam) Uboachan Fansite Infamous old RPG Maker game. Has a paid 3D remake.
Grimm's Hollow (Steam) (Itch.io) (Gamejolt) Short and mildly spooky. Multiple endings.
Azusa 999 Translated PC-98 RPGMaker adventure game.
Old/Lost RpgMaker Games - SegNin's Rare/Obscure RM Games Request Topic Handy place to find obscure games.

Also see: vgperson's site in Find More

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MUGEN and IKEMEN

Ikemen GO "Remake of the IKEMEN (open source fighting games engine that supports M.U.G.E.N resources) in Google's Programming Language “Go”."
VSelect (Mirror) Edit MUGEN select screen with drag-and-drop.
Games
Famicom Fighters ★ 8-bit styled 6-button fighting game.
Arm Joe Les Misérables (musical) fighting game.
Teenage Mutant Ninja Turtles X Justice League Turbo Impressive and has art and music by former SNK employees.
Pokémon: Type Wild (MyAbandonware) Made by former animators of the Pokémon Anime.
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Rougelikes and Rougelites

Spelunky Classic ★ The first iteration of Spelunky. Rougelike platformer.
ASCII
Brouge: Community Edition (Site for old version) A more accessible traditional rougelike. Just download the community edition.
NetHack (Online/SSH/Telnet) Rougelike about discoverability, known for the dev team thinking of everything.
Dungeon Crawl Stone Soup (SSH/Telnet) Well-known open-source rougelike.
Slaves to Armok: God of Blood Chapter II: Dwarf Fortress ★ (PeridexisErrant's Starter Pack) ★ (Steam, paid) (Itch.io, paid) The ultimate complex game. Generate a world, then look at its lore, live in it, or manage a fortress. Paid version has a built in graphical tileset and mouse controls.
Ancient Domains Of Mystery (ADOM) (Steam, paid) (GOG, paid) Started development in 1994 and actively maintained since then.
Angband (Other Site) Classic one based on J. R. R. Toilken's world. Also see Angband Live in Web.
ZangbandTK (Zangband Website) Variant of Angband.
Cataclysm: Dark Days Ahead Turn-based post-apocalyptic survival game.
Top-down
Desktop Dungeons ★ (Main Site) (Steam, enhanced) ★ Rougelike that's actually a puzzle game. Also has a paid remaster on Steam.
UnReal World (Steam, paid) Graphical rougelike RPG set in the Far North during the Iron Age.
DRL: Doom RougeLike Self-explanatory.
HyperRogue ★ Non-Euclidean, world is a hyperbolic plane.
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Rhythm Games

Stepmania NotITG Dance Dance Revolution clones/engines.
osu! Based on Osu! Tatakae! Ouendan/Elite Beat Agents.
Clone Hero Frets On Fire Guitar Hero clones.
YARG | Yet Another Rhythm Game Rock Band clone.
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Competitive/Multiplayer Focused

3D Shooters
Xonotic ★ Open-source arena shooter.
Red Eclipse (Steam) An arena shooter that works slightly different.
NEOTOKYO (Steam) (Mod DB) Futuristic Counter-Strike styled Half Life 2 mod with a godly soundtrack by the Deus Ex composer. Beginners guide.
Fistful of Frags (Steam) Western-themed Source engine arena FPS.
Fortress Forever (Steam) Spiritual successors to Team Fortress Classic and QuakeWorld Team Fortress.
Double Action: Boogaloo ★ (Steam) Third person Max Payne style shooter, complete with slowing down time, backflips, wallkicks, and so on, all in the Source engine.
Avara Port of the 1996 3D FPS.
2D Shooters
CS2D (Steam) A top down Counter Strike.
Bitfighter Top down space arena shooter with level editor.
Liero Competitive worms deathmatch with grappling hooks.
Soldat Competitive 2D shooter with jetpacks.
Teeworlds (Steam) Online sidescrolling shooter with grappling hooks. Like if an FPS was a 2D platformer.
Fighting
Uchu Mega Fight ★ PICO-8 fighting game and spiritual successor to Joy Mech Fight (NES).
Ultra Fight Da ! Kyanta 2 (Steam) ★ Ridiculous kusoge fighter.
Melty Blood: Actress Again: Current Code Community version of a fairly beginner-friendly fighting game that can run on low end hardware, with added rollback netcode. It's the one that's played in funny places.
Other
Party Project Fast-paced Mario Party clone with custom character support.
SSHTron Tron Lightcycles in the terminal with ssh.
Hedgewars (Steam) Open-source Worms clone.
Mr.Boom Bomberman clone. Also available as a RetroArch core.
Duck Marines (Itch.io) ChuChu Rocket with minigames.
Puyo Puyo VS Clone focused on online play.
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Narrative

Walking sims and Visual Novels

Off-Peak ★ (Itch.io) (Steam) Walk around a weird train station and talk to people.
Butterfly Soup (Itch.io) Butterfly Soup 2 (Itch.io) Visual Novels about lesbian asians and sports.
Murder Dog IV: Trial Of The Murder Dog (Game Jolt) Mad crime visual novel.
Of The Killer Series (Gamejolt) ★ Anthology Of The Killer (Itch.io, paid collection with extra features) ★ Odd horror-adjacent comedy games. Walk around and weird stuff happens.
Façade Experimental marridge counselling. Type anything to say it and the AI will react.
Crypt Worlds: Your Darkest Desires, Come True! (Game Jolt) Ultra weird world.
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Browser

Free-to-Play browser games (where you can pay money) are listed under the websites section

gamebutton arcade One-button games that live within HTML buttons.
Forumwarz Old RPG about trolling forums.
Minecraft Classic The old version still playable.
Brickception Multi-window double Breakout.
CANABALT The original endless runner.
Kick Ass Destroy a site with an Asteroids'style ship. Actually a bookmarklet that can turn any site into the game.
Adventure/Story
corru.observer ★ Mysterious adventure game. Crazy impressive technical achievement. Hosted on Neocities.
Stone Harbor ★ Interactive short story.
Amnesia : Restored The 1986 adventure game by Thomas M. Disch and Electronic Arts with restored cut content and modern UI features.
Black Room ★ (info, Itch.io) Feminist dungeon crawler about browsers.
Neurocracy Murder mystery told by falling down the rabbit hole on a future Wikipedia.
ARMAGAD (also Tetrageddon Games) (Steam) (Itch.io) (Gamejolt) "What the internet does to people"
Puzzle
The Wiki Game Jump from one Wikipedia entry to another.
2048 Tile-sliding.
Suika Game/Watermelon Game 2048-style fruit dropping.
Gridland Match-3 survival.
Fast Four Word Daily timed word game.
Lexy's Labyrinth Unofficial Chip's Challenge emulator. More levels available here.
LikeWordle Database of games like Wordle.
Board
Lichess Libre chess server. Patreon subscription just adds a profile badge.
Chess Tempo Free chess.
Kung Fu Chess Real time chess.
Tak Online implementation of this.
Radüm (Github) Abstract strategy.
PlayOK igGameCenter Various online board games.
hexy.games Hex and Havannah.
Calculords (Itch.io) Math-powered collectible card game. Android apk also avaliable on the itch page.
18xx.games Async or realtime board games about railroad corporations.
BirdGa.me Simple boardgames with friends.
Idle
Cookie Clicker ★ (Steam, paid) The ur idle game.
Candy Box! Candy Box 2 Some of the grandfathers of unfolding idle games.
A Dark Room Narrative idle game that reveals itself as you play.
Melvor Idle (Steam, paid) Like if Runescape was an idle game.
A Dark Room ★ (Github) Minimalist unfolding text adventure.
Toys
Townscaper Demo No goals.
Line Rider The original artistic time-waster. Also see Line Rider: Advanced in other.
Free Rider HD Like Line Rider but you can control the bike.
PlayPen Freely explorable and editable low-res pixel art world.
Screwball Scramble Recreation of a classic children's toy.
Slow Roads Relaxing procedurally-generated driving.
Multiplayer
Tough Love Arena Simple fighting game.
Hypersomnia (Steam) Fast-paced arena shooter-like
VGM Quiz Live music quiz.
Squabble Competitive Wordle.
Acrofever Acrophobia clone.
20xx.io Melee meets Quake meets MOBAs.
BlogNomic Online Nomic played on a weblog.
TradeWars 2002 Legend of the Red Dragon Classic BBS door games.
Familiars.io Creature-collecting MMO known for being playable on Twitter once.
Gartic Phone Pictionary online.
Fangames/Ports
Ocarina of Time Randomizer Sudoku ★ Zelda themed sudoku, with mechanics based on the game.
Jinteki Fanmade recreation of Android: Netrunner.
FreeCiv Civilization but open-source and in the browser.
lainTSX Recreation of Serial Experiments Lain for PS1.
Advance Wars by Web Advance Wars in the browser.
WAD Commander Play DOOM WADS in the browser.
PrinceJS (Github) The original Prince of Persia as a browser app.
Lode Runner HTML5 remake.
micropolisJS Port of Micropolis (Open-source SimCity) to Javascript.
PCjs IBM PC emulation. Does applications, too
Yolkfolk.com Games Almost all the Dizzy games.
Dinosaur Game The Chrome no internet game with leaderboards.
Defender Of The Favicon Defender in 16x16.
Bemuse Web-based beatmania clone.
Space Awesome Oreagon Trail like by Font Awesome.
Duelyst.gg Fan reimplementation of the now open-sourced TCG tactics hybrid.
Yume Nikki Online YNO Project Yume Nikki and fangames in the browser with online multiplayer.
A Little Game Called Mario (Itch.io) (Github) Open-source thing where anyone can help develop or contribute.
Sarien.net Officially sanctioned way to play old Sierra games online with others.
Angband Live The classic rougelike and a bunch of variants in the browser.
3D Pinball Space Cadet The classic Windows XP game decompiled and in the browser.
Joe Danger Both Infinity and Touch remastered and made free in the browser.
WebXash Port of Xash3D FWGS to the web. Basically Half Life 1 and other Source Engine 1 games in the browser. Related: Xash3D
Neohabitat Revival and archival of Lucasfilm's Habitat, one of the first MMOs.
robotfindskitten.org The Ultimate robotfindskitten Fan Site Super simple game with many ports.
Finardry Remake of the original Wizardry int he style of Famicom-era Final Fantasy. (Currently Japanese Only)
Free Tetris/Tetris N-Blox Tetris Tetris Gems Tetris Mind Bender Officially licensed free Tetris and Tetris variants.
New Super Mario Bros. - Mario Vs Luigi Recreation of the multiplayer mode in the DS game with custom levels.
wipEout Port to browser.
Star Trek: Borg - Remastered An FMV game upscaled to HD.
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Fangames

Another Metroid 2 Remake ★ Community Launcher v1.1 Zip (Archive.org) Remake of Metroid 2 GB Nintendo shot down, but you can still play it. Get the launcher, and give it the v1.1 zip. The launcher can also make an Android APK. Also has mods.
Street Fighter X Mega Man ★ Officially licensed fangame for both of their the 25th anniversaries.
Super Mario Bros X2 (X1) Extensive Mario fangame with level editor.
Psycho Waluigi Platformer about grabbing anything.
Command & Conquer: Twisted Insurrection Standalone mod based on the Tiberian Sun engine.
Merry Gear Solid: Secret Santa Merry Gear Solid 2: Ghost of Christmas Past Simpler, Christmas-themed MGS games.
Make a Good Mega Man Level Official site for the contest and games. Also includes guide for the Megamix Engine.
Blade Runner 9732 A virtual recreation of Deckard's apartment, with VR support.
Mari0 Mario with a Portal gun. Also includes custom levels and a level editor.
Multiplayer
Power Bomberman ★ The ultimate Bomberman game, complete with online.
Mega Man Arena ★ Platform fighter that plays like Mega Man. Also comes with co-op boss fights.
Super Mario War ★ (SMWStuff Reloaded α) (2.0 Fork) Famous open-source Mario multiplayer battle fangame with tons of custom stuff. I recommend getting the 2.0 fork. SMWStuff hosts more custom stuff.
Super Smash Flash 2 ★ Well-known fangame.
Super Smash Bros. Crusade (Gamebanana) Another good Smash fangame. Has a modpack, Crusade Modding Community Plus.
Super Smash Land ★ Smash Game Boy demake from the guy behind Rivals of Aether.
Pokémon Showdown Battle simulator.
PokeMMO Fan-run MMO built from the original games. Requires Black/White 1 ROMs to play, along with other ROMs for extra content.
Sven Co-op (Steam) Half-Life co-op.
Gang Garrison 2 2D open-source demake of Team Fortress 2.
Cave Story Multiplayer Comes with mod support and custom characters.
Apotris Really good Tetris, originally for GBA but since ported to PC and Switch.
Remakes
Rayman Redemption ★ Complete remake that makes the game so much better. Also has a level editor. And a place for those levels.
Ultimate Stunts Remake of the DOS game Stunts.
Faces of Evil and Wand of Gamelon Remastered (Archive.org) Native PC remakes of the Zelda CD-i games.
Final Fantasy Renaissance Remake of the original game in Unity. Includes mode that adds new stuff.
Manic Miners (Itch.io) Unreal Engine remake of LEGO Rock Raiders.
Nazi Zombies: Portable (In-browser version) Demake of Call of Duty: Zombies on some modified forks of the Quake engine, also on PSP, PSVita, 3DS, and Switch.
Make and Play
Mega Man Maker ★ Super Mario Maker for Mega Man. Comes with account system and in-game level browsing.
Zelda Classic Replica of The Legend of Zelda (NES). Extendable and moddable with new quests, music, etc. TV Tropes page lists some notable ones. Also available in the browser.
Shang Mu Architect Freedom Planet level creator.

Also see: Advance Wars By Web in Browser, the Sonic fangames, Sonic Robo Blast 2, the Homebrew games and Romhacks section

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Mods and Fan Ports

Also includes custom servers.

Standalones
The Dark Mod (Mod DB) Total conversion of Doom 3 into a Thief game.
Earth's Special Forces Dragon Ball Z fighter and Half-Life 1 mod.
OpenLara Open-source Tomb Raider.
ET: Legacy Open source client and server for Wolfenstein: Enemy Territory.
FreeSO Reimplementation of The Sims Online.
Zelda Again: Link is Adventuresome Zelda 2 ported to Gamemaker with new features and locations.
Croc: Legend of the Gobbos: Definitive Edition The PC version fixed and tuned for modern platforms with a bunch of extra features.
Mods
THUG Pro ★ Total conversion mod with extensive custom content. Requires an install of Tony Hawk's Underground 2.
reTHAWed An equivalent mod for Tony Hawk's American Wasteland. Requires an install of the game.
OpenXcom Open-source clone of the original UFO: Enemy Unknown/X-Com: UFO Defense. Requires the original UFO: Enemy Unknown/X-COM: UFO Defense (any version, latest patch).
Lemmini Java game engine for Lemmings. Requires Lemmings for Windows 95.
TS2 Redux (Github) Turns Homefront: The Revolution into a TimeSplitters 2 PC port by unlocking and enhancing that one easter egg. Requires Homefront: The Revolution.
Team Fortress 2 Classic ★ Reimagining the 2008-2009 era of TF2. Includes GRN and YLW teams and a new Civilian class for some modes.
Pre-Fortress 2 Like if TF2 had gameplay closer to the original Team Fortress, including grenades and armour.
Open Fortress ★ TF2 mod that turns it into an arena shooter.
Recommended Mods for Team Fortress 2 ★ Handy list.
Resident Evil 4 HD Project Texture pack made from the original sources. For the Steam port.
Silent Hill 2: Enhanced Edition Modernization and enhancement for the PC version of Silent Hill 2. Requires the original game installed.
07th-Mod Adds console voice acting and graphics to the PC version of Umineko and Higurashi. Requires the original games installed.
Skylords Reborn Fan revival of BattleForge, EA's cancelled RTS/card game.
Donut Team Mods and mod launcher for The Simpsons: Hit & Run.
Overload Maps Maps for Overload.
Custom Servers
OpenSpy 333networks Open source GameSpy revivals for many games.
ElDewrito Revival of Halo Online.
Halo Custom Edition Adds Firefight mode and modding to Halo 1 for Windows. Requires base game.
Project Cartographer Restoration of online for Halo 2 for Windows Vista, with some improvements. Requires base game.
Custom Team Fortress 2 servers Uncletopia, Potato's Custom MvM Servers, teamwork.tf (Community), TF2Center (Competitive)
Northstar ★ Custom servers and modding for Titanfall 2.
UT2004 Master Server Unreal Tournament 2004 back online with OpenSpy (and also 333networks).
Plutonium Old COD and Battlefield games with custom servers, added mod support, and enhancements.
Hawakening Lets you explore the Hawken maps in singleplayer again.
Backyard Sports Online Backyard Football and Backyard Baseball 2001's online play brought back, powered by ScummVM. Requires original copies of Backyard Football (1999), Backyard Football 2002 or Backyard Baseball 2001.
Ports and Reverse Engineering
Super Mario PC Port Central ★ Guides and tools to build the various versions of the Super Mario 64 PC port. Hosts sm64pcBuilder2, an easy way to build the game. I recommend SM64 Plus. Requires the original ROM.
Coop Deluxe Fork of the SM64 PC port to allow miltiplayer with a lot of mods.
Ship of Harkinian ★ 2 Ship 2 Harkinian ★ Feature-packed Ocarina of Time and Majora's Mask PC port. For OOT, requires the version of the ROM released on the Gamecube. Any ROM will work for MM.
Zelda 3 Launcher ★ Easy setup for the A Link to the Past reverse engineering project.
OpenGOAL ★ Jak Mods Ports for Jak and Daxter and Jak 2 and mods.
WipeOut Phantom Edition PC source port of WipeOut. Requires original PS1 USA disk image in bin/cue format.
Severed Chains (Github) Legend of Dragoon ported to PC with Java. Requires original ROMs of all discs.
The Apprentice Project Native PC remake of one of the best CD-i games.Requires an image/ISO file of the original game.
KeeperFX Open-source remake and fan expansion of Dungeon Keeper. Requires an install of the original game.
Arx Libertatis Open-source engine port for Arx Fatalis. Requires original game files.
OpenMW Modern and open source game engine for The Elder Scrolls III: Morrowind. Requires the original game files unless you want to play the original games made in the engine.
Daggerfall Unity (Github) Open source recreation of The Elder Scrolls II: Daggerfall in Unity. Requires original game files.
Exult Modern recreation of the engine for Ultima VII. Needs original game files.
OpenJazz Jazz Jackrabbit source ports. Requires original data files.
Jazz2Online Jazz Jackrabbit fansite which hosts levels and other stuff.
JJ2+ Fan patch for Jazz Jackrabbit 2. Guide to getting JJ2+ with GOG
Commander Genius Commander Keen and Cosmos the Cosmic Adventure interpreter.
Rigel Engine Reimplementation of Duke Nukem 2. Requires data files, can use shareware version (how to get).
OpenJKDF2 Cross-platform port of Star Wars: Jedi Knight: Dark Forces 2. Playable in the browser! Requires game assets.
Umineko Project Port of the PS3 version of Umineko to PC and other places. Requires original files of both PC and PS3 versions.
Anodyne Fan Remake (Itch.io) ★ Fan rewrite of Anodyne based on the source code.
Open Fodder Open Source port of Cannon Fodder. Full version requires retail release files.
GemRB Open-source port of the Infinity Engine (Baldur's Gate, Icewind Dale, Planescape Torment).
N64: Recompiled N64 games statically recompiled for quick PC ports. Currently only works with Majora's Mask. Requires original ROMs.
Super Metroid (Alt) Paper Mario 64 Banjo Kazooie Mario Kart 64 Various Zelda games and Animal Forest/Animal Crossing 64 Goldeneye Perfect Dark (PC Port) Duke Nukem Zero Hour N64 Other N64 decompilations Miscellaneous decompilations. All decomps are not necessarily finished and require original ROMs.

Also see: The RSDK decompilations for the classic Sonic mobile ports.

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Make and Play

MegaZeux Like a modernized ZZT.
Knytt Stories + (Levels) (Recommended Levels) Platformer with level creator.
I Wanna Maker (Steam) Mario Maker for I Wanna Be The Guy.
Solarus Game engine for ARPGs (Zelda-likes). Launcher can download games.
BYOND Old platform for online multiplayer games. Famous for Space Station 13, Mitadake High, and Nestalgia.
VVVVVV: Make and Play edition (Page on official site) The official free level editor.Featured levels here.
Tomb Raider Level Editor The one from Tomb Raider V: Chronicles. Levels avaliable on TRCustoms and trle.net. Lot of them standalone, too.

Also see: Mega Man Maker (and more) in Fangames

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Other

The Unofficial Homestuck Collection ★ (Experimental web version) Special offline browser for reading Homestuck and related media as originally intended, complete with new reader mode that hides spoilers. Moddable, too.
Skeal (Itch.io) ★ (Web version) 5 minute Christmas-adjacent game.
Fontemon A whole videogame in a font.
Moonring (Steam) Neon Ultima 4 like from the co-creator of Fable.
Krystal Drop Magical Drop clone.
Deltarune (Chapters 1 and 2) ★ Might not be free once the rest of the game is out.
Endless Sky Space trading and combat.
Space Station 13 ★ Role-playing game about a space station falling into chaos. Most popular game hosted on the BYOND platform.
Space Station 14 (Steam) Remake of Space Station 13 in development.
Point-and-clicks and Puzzles
Samorost 1 (Steam) (Itch.io) Surreal point and click game.
If On A Winter's Night, Four Travelers ★ (Steam) (Itch.io) Point and click anthology.
Sprout (Steam) ★ Puzzle game about a seed on a journey.
The Looker (Steam) ★ Good parody of The Witness.
Helltaker ★ Puzzle/VN game.
Physics Toys
The Powder Toy (Steam) Physics sandbox toy.
Line Rider: Advanced Open Source version of the classic Flash art tool game. For more Line Rider, see browser games.
YSFlight FlightGear Free flight simulators.
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Find More

Collections and Lists (and Hosts)
Open Source Game Clones Open-source remakes of old games.
Awesome Game Remakes Open-source remakes of games.
Games on GitHub Open source games and game-related projects.
Emulation General Wiki's Game engine recreations and source ports List of other source ports.
TV Tropes List of Freeware Games Organized, also has links to other sites.
/v/'s Recommended Games Wiki Sorted by genre.
rpgmaker.net Host of a whole bunch of RPGMaker games.
Free Games vgperson Translated Some translated RPGMaker games.
DOS Haven New homebrew DOS games.
Delicious Fruit IWBTG-style fangames.
Mario Fan Games Galaxy The largest repository of Mario fan games.
Glorious Trainwrecks Celebrating games with low polish.
Cool Math Games Newgrounds Famous web game portals.
David J Prokopetz's Free Steam Games List by prokopetz@tumblr.com
games from the Indie Interregnum Games made before Steam but too new for archive.org. By zaratustra.
Shareware Game Developer Websites Various websites that are still active.
Freeware Remakes of Adventure Games Features remakes of classic games.
Let's Get Creative Creative toys.
The Passion Project (Cohost) Launchbox-powered collection of fan games, WADs, source ports, and decompilation. Includes many of the entries on these pages.
DOS_deck DOS games in the browser, preconfigured for controller support.
Neonaut's Freeware Games Page of Excellence Inspired what this page used to be called.
Bytemoth's Ways to Play ★ Another Neocities site with a list of games.
Archives
Flashpoint ★ 9o3o (Web version) Huge archive of Flash games and animations, and other internet plugins too.
FlashMuseum Flash games in browser through Ruffle.
My Abandonware ★ Abandonware site, 1978-2010.
The Collection Chamber Abandonware games and movies. Games pre-packaged to work on modern hardware.
Zomb's Lair Abandonware pre-packed to work on modern systems.
Macintosh Garden Abandonware site, focus on Macintosh.
Mac Source Ports Old games on new Macs.
Macintosh Repository Archive of old Mac games and software.
Kliktopia Games made in Klik & Play, The Games Factory, Click & Create, Multimedia Fusion and Clickteam Fusion.
DOSGames.com Old freeware DOS games.
Developer Sites
Nitrome ★ Prolific flash game devs, emulated with Poki.
SCUM Games Games for the TempleOS. Hosted on Neocities. See also: TempleOS in Websites.
Locomalito Many retro-style games.
Arcane Kids ★ Fantastic Dreamcast-like games. For the games unavailable on their site: Perfect Stride ★ Crap! No One Loves Me
Everett Kaser Software Logic and puzzle board games.
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