- 2006-rebotted (Java, 2-clause BSD, mature)
- 2006scape (Java, GPL-3.0, mature)
- 2009scape (Java, Kotlin, AGPL-3.0, mature)
- Allure of the Stars (Haskell, AGPL-3.0, beta)
- Ambermoon.net (C#, GPL-3.0, mature)
- Andor's Trail (Java, GPL-2.0, beta)
- Angband (C, GPL-2.0, mature)
- Anteform (Lua, GPL-3.0, beta)
- ArchaicQuest II (C#, MIT, mature)
- Ardentryst (Python, GPL-3.0, mature, inactive since 2009)
- Argentum Online (Visual Basic, GPL-2.0, AGPL-3.0, beta, inactive since 2014)
- Arx Libertatis (C++, GPL-3.0, mature)
- Atrinik (C, Python, GPL-2.0, mature, inactive since 2016)
- Avanor (C++, Lua, C, GPL-2.0, beta, inactive since 2008)
- Barony (C++, GPL-3.0, mature)
- Battleround (Java, Apache-2.0, beta, inactive since 2015)
- Betrayer's Moon Tactics (JavaScript, GPL-2.0, beta, inactive since 2006)
- Boohu (Go, ISC, beta)
- Brogue (C, AGPL-3.0, mature)
- BrowserQuest (JavaScript, MPL-2.0, mature)
- BStone (C++, GPL-2.0, mature)
- Candy Box 2 (TypeScript, JavaScript, GPL-3.0, mature, inactive since 2013)
- Castle of the Winds in Elm (Elm, JavaScript, MIT, beta)
- Castle of the Winds (JavaScript, MIT, beta, inactive since 2016)
- Cataclysm: Dark Days Ahead (C++, CC-BY-SA-3.0, mature)
- Cataclysm (C++, CC-BY-SA-3.0, beta, inactive since 2012)
- Catch Challenger (C++, C, GPL-3.0, mature)
- Children of Ur (Dart, JavaScript, MIT, beta)
- Choria (C++, C, Lua, GPL-3.0, mature)
- Classic Blades of Exile (C++, GPL-2.0, mature)
- ClassicUO (C#, 4-clause BSD, beta)
- Crossfire (C, Java, GPL-2.0, mature)
- CrossUO (C, C++, GPL-3.0, mature)
- Crosswords (Java, GPL-2.0, mature)
- Daggerfall Unity (C#, MIT, mature)
- Daimonin (C, GPL-2.0, mature)
- DarkCity (PHP, GPL-3.0, mature, inactive since 2012)
- Darkflame Universe (C++, AGPL-3.0, mature)
- Dawn (C++, Lua, GPL-3.0, beta, inactive since 2011)
- Deathlord Relorded (C, C++, AGPL-3.0, mature)
- Decker (Java, GPL-2.0, beta, inactive since 2013)
- Delaford (JavaScript, PHP, MIT, beta)
- Deliantra (C, Perl, C++, GPL-2.0, mature)
- DemiGod (Java, GPL-3.0, beta, inactive since 2013)
- diablo-js (Java, JavaScript, MIT, mature)
- Dink Smallwood HD (C, Custom, mature)
- Dmomd (Lisp, GPL-3.0, mature)
- DNT (C++, GPL-3.0, beta, inactive since 2016)
- Dragon Hunt (Python, GPL-2.0, mature)
- DRL (Lua, Pascal, GPL-2.0, mature)
- Dungeon Craft (C++, GPL-2.0, mature)
- Dungeon Crawl Stone Soup (C++, Lua, GPL-2.0, mature)
- Dungeon Eye (C#, GPL-3.0, beta, inactive since 2016)
- Dungeon Hero (Java, MIT, mature)
- Dungeon Monkey Eternal (Python, GPL-2.0, mature, inactive since 2016)
- Dungeon Monkey Unlimited (Pascal, LGPL-2.1, mature, inactive since 2010)
- Dungeon Quest (Java, MIT, mature)
- Dungeon (Java, 3-clause BSD, mature)
- EasyRPG Editor (C++, GPL-3.0, mature)
- Egoboo (C++, C, GPL-3.0, mature, inactive since 2015)
- ElonaFoobar (C++, Lua, MIT, mature)
- Elysium Engine (C, GPL-2.0, beta, inactive since 2006)
- Empty Clip (C++, GPL-2.0, mature)
- EmptyEpsilon (C, C++, Lua, GPL-2.0, mature)
- Endless Sky (C++, GPL-3.0, mature)
- Eos, Dawn of Light: A Space Opera (Python, MIT, beta, inactive since 2007)
- Erebus (C++, GPL-3.0, beta)
- Eternal Lands (C, C++, Custom, mature)
- Exult (C++, GPL-2.0, mature)
- Fall of Imiryn (C++, Python, GPL-3.0, beta, inactive since 2009)
- Fallen Spire (Python, GPL-3.0, beta, inactive since 2009)
- Falling Time (C, C++, GPL-2.0, mature)
- Fallout 2 Community Edition (C++, Custom, mature)
- Falltergeist (C++, GPL-3.0, beta)
- freeablo (C++, GPL-3.0, beta)
- FreedroidRPG (C, C++, Lua, GPL-2.0, mature)
- Fujo (Python, CC-BY-SA-4.0, mature, inactive since 2014)
- GalaxyMage Redux (Python, GPL-2.0, beta, inactive since 2011)
- GearHead 2 (Pascal, LGPL-2.0, beta)
- GearHead (Pascal, LGPL-2.1, Apache-2.0, mature)
- Gee Whiz (C, Script, GPL-2.0, beta, inactive since 2004)
- GNU FreeDink (C, GPL-3.0, mature, inactive since 2012)
- Goblin Hack (C++, GPL-2.0, beta, inactive since 2009)
- Griefly (C++, Go, Python, MIT, beta)
- Hack (C, 3-clause BSD, mature, inactive since 1985)
- Hale (Java, GPL-2.0, beta, inactive since 2014)
- Harmonist: Dayoriah Clan Infiltration (Go, ISC, beta)
- Harvest Moon 2.0 (GDScript, MIT, beta, inactive since 2020)
- Haxima (C++, GPL-3.0, beta)
- Hero of Allacrost (C++, Lua, GPL-2.0, mature)
- Heroine Dusk (JavaScript, GPL-3.0, mature, inactive since 2017)
- heXon (C++, GPL-2.0, beta)
- HolySpirit (C++, Haskell, GPL-3.0, beta, inactive since 2013)
- Honey Town (C#, GPL-3.0, beta, inactive since 2020)
- HyperRogue (C++, GPL-2.0, mature)
- ika (C++, Python, PHP, C#, GPL-2.0, beta, inactive since 2007)
- Ilarion (C++, Java, Lua, GPL-3.0, mature)
- Illarion (C++, Java, Lua, AGPL-3.0, GPL-3.0, mature)
- Imperium (?, ?, mature)
- Intersect (C#, MIT, GPL-2.0, beta)
- Iris2 (C, C++, Lua, GPL-3.0, beta, inactive since 2017)
- Isleward (JavaScript, AGPL-3.0, mature)
- Iter Vehemens ad Necem (C++, GPL-2.0, beta)
- Javelin (Java, GPL-2.0, mature, inactive since 2016)
- jClassicRPG (Java, LGPL-3.0, beta, inactive since 2010)
- JiGS Interactive Game System (JavaScript, PHP, GPL-3.0, beta)
- jsFO (JavaScript, Python, Apache-2.0, beta, inactive since 2017)
- JSkat (Java, GPL-3.0, Apache-2.0, beta)
- Knights (C++, GPL-3.0, beta, inactive since 2014)
- Kobold's Quest 2 (Python, LGPL-3.0, beta, inactive since 2011)
- Korax' Heritage (None, ?, mature)
- KQ Lives (C, GPL-2.0, beta, inactive since 2011)
- Krank (Python, Public domain, beta, inactive since 2008)
- Kryftolike (Pascal, GPL-3.0, mature)
- Labyrinth of Worlds (C++, LGPL-3.0, beta, inactive since 2010)
- LambdaRogue: The Book of Stars (Pascal, GPL-2.0, mature, inactive since 2012)
- Land of Fire (Script, PHP, GPL-2.0, beta)
- LegionGame (C#, GPL-3.0, beta)
- Liberal Crime Squad (C++, GPL-2.0, mature, inactive since 2012)
- Linley's Dungeon Crawl (C, C++, Custom, mature, inactive since 2006)
- Lips of Suna (C, Lua, C++, GPL-3.0, beta, inactive since 2014)
- LOZ (C++, C#, Apache-2.0, beta)
- lttp-phaser (TypeScript, JavaScript, MIT, beta, inactive since 2016)
- Magarena (Java, Groovy, GPL-3.0, mature)
- Magical Life (C#, MIT, beta)
- Mana (C++, GPL-2.0, beta)
- ManaPlus (C++, GPL-3.0, mature)
- Meridian 59 (C++, C, GPL-2.0, mature)
- Meritous (C, C++, GPL-3.0, mature, inactive since 2008)
- Minima (Lua, GPL-3.0, mature)
- Monstrosity (Python, MIT, mature)
- Moubootaur Legends (C, C++, Script, GPL-3.0, beta)
- Naev (C, Lua, GPL-3.0, mature)
- NetHack (C, Custom, mature)
- NetMauMau (C++, LGPL-3.0, mature, inactive since 2015)
- NLarn (C, Lua, GPL-3.0, mature)
- NorseWorld: Ragnarok (C#, GPL-3.0, beta)
- Open Jumpgate (C++, GPL-2.0, beta, inactive since 2017)
- Open Legend RPG (None, Custom, mature)
- Open Meridian (C, C++, GPL-2.0, mature)
- Open RPG Maker (C++, GPL-3.0, beta, inactive since 2014)
- Open RSC (Java, C++, C, Objective-C, AGPL-3.0, mature)
- Open Tibia (C++, GPL-2.0, beta, inactive since 2014)
- Open Valley (C++, CC-BY-NC-SA-4.0, beta)
- opendf (C++, GPL-3.0, beta)
- OpenDiablo2 (Go, GPL-3.0, mature)
- OpenEnroth (C++, LGPL-3.0, beta)
- OpenFNaF (C, MIT, beta)
- Openglad (C++, GPL-2.0, mature, inactive since 2004)
- OpenGothic (C++, MIT, beta)
- OpenMW (C++, GPL-3.0, mature)
- OpenNefia (C#, Lua, MIT, beta)
- OpenRPG (Python, GPL-2.0, mature, inactive since 2013)
- OpenVIII (C#, MIT, beta)
- ORIENT (C#, Java, GPL-2.0, mature, inactive since 2009)
- Other-Life (C, C++, Custom, beta)
- Paper Isaac (ooc, MIT, beta, inactive since 2015)
- PARPG (Python, GPL-3.0, beta, inactive since 2012)
- Passage (C++, Public domain, mature, inactive since 2011)
- Pentagram (C++, GPL-2.0, beta, inactive since 2018)
- Pentobi (C++, GPL-3.0, mature)
- Peragro Tempus (C, C++, GPL-2.0, beta, inactive since 2012)
- Phantasy Star Rebirth (C++, GPL-3.0, beta, inactive since 2013)
- phpRPG (PHP, GPL-2.0, beta, inactive since 2006)
- Pixel Dungeon (Java, GPL-3.0, mature, inactive since 2015)
- PlaneShift (C++, GPL-2.0, mature)
- Project Helena (Pascal, GPL-3.0, beta, inactive since 2018)
- Project-Uranium-Godot (GDScript, MIT, beta)
- Q-Gears (C, C++, GPL-2.0, beta, inactive since 2015)
- Radakan (Python, Custom, beta, inactive since 2014)
- ransack (Python, MIT, mature, inactive since 2016)
- REGoth (C++, GPL-3.0, MIT, mature)
- Reldens (JavaScript, MIT, mature)
- Remixed Dungeon (Java, GPL-3.0, mature)
- reone (C++, GPL-3.0, beta)
- Rogue Clone IV (C, 3-clause BSD, mature, inactive since 2006)
- RogueBox Adventures (Python, GPL-3.0, mature)
- Roguish (JavaScript, 3-clause BSD, beta, inactive since 2015)
- Room for Change (Java, Apache-2.0, mature, inactive since 2013)
- Rot Magus (JavaScript, Apache-2.0, CC0, beta)
- RPG Tactical Fantasy Game (Python, GPL-3.0, mature)
- rpgboss (Scala, JavaScript, AGPL-3.0, beta, inactive since 2017)
- rpge (C, Script, GPL-3.0, beta, inactive since 2014)
- RuneLite (Java, 2-clause BSD, mature)
- Ryzom Core (C++, PHP, AGPL-3.0, mature)
- S.C.O.U.R.G.E. (C++, GPL-2.0, beta, inactive since 2008)
- Shattered Pixel Dungeon (Java, GPL-3.0, mature)
- SilverTree (C++, GPL-3.0, beta, inactive since 2007)
- SLASH'EM (C, C++, Custom, beta, inactive since 2007)
- Sleep Is Death (C++, ?, mature, inactive since 2018)
- Solarus (C, C++, Lua, GPL-3.0, mature)
- Source of Tales (Lua, GPL-3.0, mature, inactive since 2013)
- Space Station 13 (DM, AGPL-3.0, mature)
- Spice Trade (Java, LGPL-2.1, mature, inactive since 2005)
- SS13 Remake (C#, GPL-3.0, beta, inactive since 2015)
- Stendhal (Java, GPL-2.0, mature)
- Storm Engine (C++, GPL-3.0, mature)
- Story of a Lost Sky (Python, 3-clause BSD, mature)
- Summoning Wars (C, C++, Lua, GPL-3.0, beta, inactive since 2014)
- Sundog: Frozen Legacy (C, Python, MIT, mature)
- sundog (C, C++, Python, MIT, beta)
- Taggem (JavaScript, AGPL-3.0, beta, inactive since 2014)
- Tales of Maj'Eyal (C, Lua, GPL-3.0, mature)
- The Clans (C, Objective-C, GPL-2.0, beta, inactive since 2003)
- The Dark Mod (C++, GPL-3.0, mature)
- The Endless Dungeons (C, CC-BY-NC-SA-2.0, mature, inactive since 2015)
- The Epic of Heroes (C++, GPL-3.0, beta, inactive since 2015)
- The hunt for the lost rainbow jewels (Jewelhunt) (Java, GPL-2.0, beta)
- The Mana World (C++, Script, GPL-2.0, mature)
- TinTin++ (C, GPL-3.0, mature)
- Titan Tactics (GDScript, CC0, beta)
- Trinity Reign (C++, C, GPL-3.0, beta, inactive since 2013)
- Turbu (Pascal, MPL-1.1, beta, inactive since 2013)
- Tuxemon (Python, GPL-3.0, beta)
- TuxKart (C++, GPL-2.0, beta, inactive since 2004)
- UAlbion (C#, MIT, beta)
- Ularn (C, C++, GPL-2.0, mature, inactive since 2018)
- UlDunAd (Python, GPL-3.0, beta, inactive since 2011)
- Ultima 5 Redux (C#, MIT, beta)
- Umbra (Python, Custom, beta, inactive since 2002)
- Umoria (C, C++, GPL-3.0, mature)
- Underworld Adventures (C++, Lua, GPL-2.0, beta)
- UnderworldExporter (C#, C++, MIT, mature)
- UnNetHack (C, Custom, mature)
- Valyria Tear (Lua, C++, C, GPL-2.0, mature)
- Vangers (C++, GPL-3.0, mature)
- Veloren (Rust, GPL-3.0, beta)
- Vulture's Eye (C++, C, NetHack General Public License, mature, inactive since 2015)
- Waste's Edge (Python, GPL-2.0, beta)
- Witch Blast (C++, GPL-3.0, beta, inactive since 2015)
- Wograld (C, GPL-2.0, beta)
- World of Might and Magic (C++, LGPL-3.0, beta)
- World of Phaos (PHP, GPL-2.0, mature, inactive since 2011)
- WorldForge (C++, GPL-2.0, mature)
- WTF?! Adventure (JavaScript, WTFPL, mature)
- xu4 (C++, GPL-2.0, mature, inactive since 2016)
- ZAngband (C, Custom, mature, inactive since 2005)
- Zelda Classic (C, C++, GPL-3.0, mature)
- Zelda: Mystery of Solarus DX (Lua, GPL-3.0, mature)