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Code languages: C++
Code licenses: GPL-2.0
Code repositories: Marisa-Chan/UA_source.git(since 2015, )
Code dependencies: SDL
Build system: Make
Developers: Anton Yarcev, Marisa-Chan, Max

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Code languages: C#
Code licenses: MIT
Code repositories: csinkers/ualbion.git(since 2020, )
Developer: Cam Sinclair

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Code languages: C#
Code licenses: AGPL-3.0
Code repositories: UchuServer/Uchu.git(since 2018, )

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Daniel, Elena Winters, Fro Zen, Jett, Matthew Schweiss, Mick, TecCheck, TheNexusAvenger, Wincent Holm, yui​, Zachary Cook, zaop

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Code languages: TorqueScript, C#
Code licenses: MIT
Code repositories: Duion/Uebergame.git(since 2014, )
Code dependencies: Torque 3D
Assets licenses: ?
Developers: Alex Piola, ZOD

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Code languages: C, C++, Lua
Code licenses: GPL-2.0
Code repositories: ufo2000/ufo2000.git(since 2010, ), svn.code.sf.net/p/ufo2000/code
Developers: Fomka, Siarhei Siamashka

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Code languages: C, C++
Code licenses: GPL-2.0
Code repositories: ufoaiorg/ufoai.git(since 2011, ), git.code.sf.net/p/ufoai/code
Code dependencies: Quake II engine, SDL
Build system: CMake

Developers: (34)

aDuke1, Alexander Tishin, AndrewRSmart, anthraxx, bayo, BTAxis, CH, DarkRain, DarkRainX, drane, Duke, Forest Hale, geever, Holger 'ShipIt' Gellrich, hwoarangmy, Ihor Hrytsenko, Internecivus Raptus, Kostia Romanov, Kracken, Maksym Kobieliev, Martin Gerhardy, Muton-UfoAI, Nate Wright, NateWr, radius75, Rudolfo Pinewood, rxadmin, Sander van Grieken, Sergii Pylypenko, Solbu, Tamás Fehérvári, Tron, UFO: Alien Invasion, UFOAI

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Code languages: C, C++
Code licenses: GPL-2.0
Code repositories: ularn/ularn.git(since 2012, )
Build system: Make
Developers: Ethan Dicks, Josh Bressers, Scott Neugroschl, Thomas Huth

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Code languages: Python
Code licenses: GPL-3.0
Code repositories: nhydock/UlDunAd.git(archived, since 2010, )
Code dependencies: NumPy, OpenGL, Pillow, pygame, wxPython
Developers: Nicholas Hydock, Nicholas Hydock / ero, stump

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Code languages: C#
Code licenses: MIT
Code repositories: bradhannah/Ultima5Redux.git(since 2019, )
Developers: Brad Hannah, MrMan4th

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Code languages: C++
Code licenses: GPL-2.0
Code repositories: svn.code.sf.net/p/ultimatestunts/code, ultimatestunts.cvs.sourceforge.net
Build system: Make
Developers: Borbola Balázs, CJP, M Gagnon, Neil Zanella

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Code languages: Pascal
Code licenses: GPL-2.0
Code repositories: UltraStar-Deluxe/USDX.git(since 2015, ), UltraStar-Deluxe/legacy-sourceforge-svn-mirror.git @add(archived, since 2015, ), svn.code.sf.net/p/ultrastardx/svn
Code dependencies: Lua, SDL2
Build system: Lazarus project

Developers: (41)

Alexander, Alexander Sulfrian, barbeque-squared, basisbit, Benedikt Krueger, blindy, Brian, Brian Chalega da Silva, brianch, brunzel, Canni, Dawid Dembowski, djazz, Eddie, ePirat, Felix Kaechele, GaryCXJk, Hermann Döppes, Holger Kuhn, jay binks, joachimdieterich.com, Jose Riha, K.-M. Schindler, Karl-Michael Schindler, lotan_rm, Markus, Markus Böhning, Marvin Scholz, MezzoX, Mog, mota23, RattleSN4K3, s09bQ5, shazzzzam, Simon Ruderich, Stefan, Stefan L., TheNotary, Tobias Gunkel, Valérianne, Whiteshark

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Code languages: C#
Code licenses: MIT
Code repositories: UltraStar-Deluxe/Play.git(since 2017, )
Code dependencies: Unity
Developers: achimmihca, Andreas, barbeque-squared, basisbit, Dex, Jean Moreno, Michiel, Stefan, Sven Kubisch

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Code languages: C++
Code licenses: GPL-2.0
Code repositories: jakowskidev/uMario_Jakowski.git(since 2015, )
Code dependencies: SDL2
Build system: CMake
Developers: Tony Narlock, Łukasz Jakowski

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Code languages: Python
Code licenses: Custom
Code repositories: osgames/umbra.git(since 2018, )

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Code languages: C, C++
Code licenses: GPL-3.0
Code repositories: dungeons-of-moria/umoria.git(since 2016, ), acahir/moria.git
Assets licenses: no media
Developer: Michael R. Cook

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Code languages: Kotlin
Code licenses: MPL-2.0
Code repositories: yairm210/Unciv.git(since 2017, )
Code dependencies: libGDX
Assets licenses: CC-BY
Build system: Gradle

Developers: (101)

9kgsofrice, AdityaMH, Alexander Korolyov, alexban011, Am-per-Sand, armandberger, Aron de Jong, Arthur van der Staaij, Augusto Oliveira, Brian, Brian Gainor, Bryan W. Weber, Caballero Arepa, coding-human, Coruna, CrispyXYZ, Crsi, Daniel Bälz, dHannasch, dic1911, Duan Tao, F4R3LB3ST, Fantaziu Ion, Federico Luongo, Framonti, Freshy, GGGuenni, Giuseppe D'Addio, givehub99, Gualdimar, HadeanLake, heipizhu4, itanasi, Jack Rainy, jnecus, Joan Josep, Kensvin, Kentalot, LeMoonStar, Leonard Günther, letstalkaboutdune, lishaoxia1985, logic, lyrjie, mape6, Marerjh, MartinP, Md. Touhidur Rahman, MindaugasRumsa51, mrimvo, nacro711072, Nick Hsu, NoNZeeZ, ofetios, Oheto, Oleg, OptimizedForDensity, Oskar Niesen, Ouaz, paontv, Paul Pogonyshev, Philip Keiter, pikkolpk, PLynx, Prosta4okua, proteus-anguinus, RadioMagnetofonStereofoniczny, ravignir, rayray61, RCalleti, Roumaan, Runo Hawk, Rémi Dufour, SeventhM, SimonCeder, Skekdog, soggerr, someone, SomeTroglodyte, SpacedOutChicken, StepanIvasyn, sulai, sveckarel, The Bucketeer, Timo T, u-ndefine, vegeta1k95, vhj, Vladimir Tanakov, Voytee, Väinö Mäkelä, WhoIsJohannes, Why-not-now, Will Allen, will-ca, wrov, Xander Lenstra, xk730, Yair Morgenstern, Yann, Yattong the Mackerel

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Code languages: C++, Lua
Code licenses: GPL-2.0
Code repositories: vividos/UnderworldAdventures.git(since 2019, ), uwadv.cvs.sourceforge.net
Developers: Aisha Fenton, Dirk Manders, Jim Cameron, Kasper Fauerby, Michael Fink, Mike Ratzlaff, Radoslaw Grzanka, vividos, Willem Jan Palenstijn

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Code languages: C#, C++
Code licenses: MIT
Code repositories: hankmorgan/UnderworldExporter.git(since 2014, )
Code dependencies: Unity
Developer: hankmorgan

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Code languages: C, C++
Code licenses: Artistic License-2.0
Code repositories: DavidGriffith/uninvited.git(since 2013, )
Code dependencies: Inform
Build system: Make
Developer: David Griffith

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Code languages: C#
Code licenses: Custom
Code repositories: stuart73/UnityPacmania.git(since 2021, )
Developer: stuart73

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Code languages: C#
Code licenses: AGPL-3.0
Code repositories: unitystation/unitystation.git(since 2016, )
Code dependencies: Unity

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[Redacted], a_heckin_canadian, actions-user, Adalino, Ahion, Akbadain29, Akronymus, aleios, Aleios, Alessandro Romancino, Alex, Alex Evgrashin, Alvin, Alvin Huynh, Andre Odendaal, Aranclanos, Atner, Autumn, Azzy, badbon, Badgers2, Baran Barut, Bebob, Bobtheapple, Bod9001, Bon, Bonfire, Buldinn, C4BRA, Carbon, Cardioxo, Cassie Villarreal, chairbender, Christian Bender-Saebelkampf, Christopher Moore, CodeKalias, coolcat1711, Copern, craftxbox, cvdva, Daniel, dapocalypse, DeeJayhX, dillonfurey, DMCraftGit, Donovan Hubbard, Doobly, DRAbsol, drneuris, DTraitor, Elijah Burshtein, Em3rgencyLT, Emma3DSS, Epicworlds, Eugene, Evan Rogers, Fax, Fiftyllama, Foma, Fortune117, Francesco, fuele, FuntimeDudeski, Gavin Rowan, Gentle Jester, Gil, Gilles, goman0, h3killa, Harcourt1, havietisov, Hex, HiddenKnowledge, Human Being, Humonitarian, IlinMihail, jackpotttt, Jacob Sweeten, James, James Simonson, JaytleBee, Jeremy Liberman, JesterX666, Jibbajabbafic, Joel Hedtjärn, Jorge Martinez, Josh M., Justin Trotter, Kavik/Rena, Keir Smith, Kjeld Schouten, Kjeld Schouten-Lebbing, ktndrnl, Kyle Hipke, LastCaptainBonk, Lennoxicon, Leonard K, Lizurt, LukaErCaiman, Max, MaxIsJoe, Michael Bolland, Michael Nader, Michał Czemierowski, Moon, Moses, MrAsbestos, Necromunger, Nick M., Nickolas Gupton, Nikolas Petrou, NinjaDanz3r, NoooneyDude, NuclearWinter, nuke, Ofek, PerfectTangent, PetMudstone, Puzzlemaker1, Pyrosshade, Ranzarth, Raptorizer, RedlineTriad, ReiderJack, Rember, RemberBL, Remo Andreoli, Richard Van Tassel, Robustin, Russell Rozario, Scorr, Semuca, Serhey, Shelby Drabant, Silver-Ace, Skrimble, SluggyWuggies, spacerecycler, Steven Kessler, ThangCZ, ThatDan123, THE0BEAST, TheGreatShelbino, Tim, Tjarr737, Vlad, vladb, Vladimír Kincl, Vlandemart, wraith-54321, YotaXP, yoysam, Zagamun, Ziiiiiplock

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Code languages: Python
Code licenses: GPL-2.0
Code repositories: unknown-horizons/unknown-horizons.git(since 2010, )
Code dependencies: FIFE, Pillow
Build system: setup.py

Developers: (111)

Aaron Franke, Adrian-Mihai Iosif, Aleksi Kinnunen, Allan Nordhøy, Andre R., Andriy Bandura, Andrzej Bylicki, Andy Bylicki, Andy Mender, Antagonym, Armcoon, Arthur S. Muszynski, Arti, avalon3515, Bernhard M. Wiedemann, Bernhard Mallinger, bringerer, chobkwon, Chris Oelmueller, Christoph Egger, cmocanu, Daniel André Eikeland, Daniel Stephens, David Ulrich, Davide Nanni, desophos, DSAureli, Elizabeth Sherrock, Emil Hemdal, Fabian Streitel, Felix Wang, Ghislain LEVEQUE, GreshamDanielStephens, GreyGhost, hepfnepf, icyvapor, Ivan, J.M. de Jong, Jakub Janek, Jana Weigel, jdigreze, Joan Josep, JOKer, Jorge Maldonado Ventura, Karar Al-Remahy, kennedyshead, Koji, Kornelijus Tvarijanavičius, Krzysztof Nowak, KT, LafarM, LostDaemon, Luis Martinez, Luiz Fernando Ranghetti, Lukáš Krejza, Mantas Kriaučiūnas, Manuel Mausz, Marius Schiffer, Markus Hackspacher, Mayeul Cantan, Mesutcan Kurt, Michael Alexsander, Michal Čihař, Mihai Bivol, Milo Ivir, milotype, Moritz Beller, Niektory, Nightraven, Nihathrael, nxxs, OlhaQue, Omar Aglan, Omaranwa, Ott Tinn, PacLow, Pavel, Pedro Henrique, Per Hermansson, Polshakov Dmitry, ptrsk, Ramon, Raphael Isemann, Reiner Gerecke, Robert Mitwicki, Rubén Viguera Marañón, rudis, Rui, ryzakka, Sandra, schtritoff, Sebastian Rasmussen, Siddharth Kothari, Silvério Santos, Slobodan Simić, Szabolcs Tóth, Thomas Kinnen, Thomas Kowaliczek-Schmer, Tobias Schröfel, totycro, totycro uhyi, Translators, tschroefel, ttoocs, Tuomas Lähteenmäki, UnknownScribe, Viktoria S., Vivek, Volkan Gezer, Weblate (bot), Zappaman

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Code languages: GDScript
Code licenses: GPL-2.0
Code repositories: unknown-horizons/godot-port.git(since 2019, )
Code dependencies: Godot
Developers: Aaron Franke, Arthur S. Muszynski, hepfnepf, IcyLeave6109, Michael Alexsander

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Code languages: C
Code licenses: Custom
Code repositories: unnethack/unnethack.git(since 2014, ), git.code.sf.net/p/unnethack/git, svn.code.sf.net/p/unnethack/code

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aaxelb, copperwater, David Haft, Fredrik Ljungdahl, Guanpeng Xu, Guest41, guest41, gurr, Karl Garrison, kdgarris, Keith Simpson, Michael Meyer, Mikko Juola, NHTangles, Pasi Kallinen, Patric Mueller, Raz, tedav, Tung Nguyen, xororand

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Code languages: C, C++
Code licenses: GPL-3.0
Code repositories: Unvanquished/Unvanquished.git(since 2011, ), DaemonEngine/Daemon.git @add(since 2015, )
Code dependencies: Dæmon
Assets licenses: CC-BY-SA-2.5
Build system: CMake

Developers: (49)

777yur0k, Amanieu d'Antras, Anthony J. Bentley, AvengerAnubis, caldazar-at, cmf028, Corentin Wallez, cu-kai, Darren Salt, David CARLIER, DefaultUser, DeLift, Dimitriio, Dmitry Tsarevich, Dolce Triade, Emily Fiorentini, gimhael, Gireen, gmcode, Grise, hurf blurf, Jani Mäkinen, jaytersen, Jojonintendo, kharnov, M. Kristall, maek, Mattia Basaglia, Maximilian Stahlberg, meme-spider, Morel Bérenger, NaitLee, necessarily-equal, neumond, Paweł Redman, Sixthly, slipher, sweet235, Theodoros Theodoridis, Thomas Debesse, Tim, TimePath, Trinitrotoluene-, Veyrdite, Viech, VReaperV, Zachary L, Zack Middleton, zturtleman

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Code languages: C++
Code licenses: zlib
Code repositories: dpjudas/UTEngine.git(since 2020, )
Build system: CMake
Developers: LupertEverett, Magnus Norddahl, neuromancer, SubprimeMover, Xaleros