Homepage: www.artificialworlds.net/rabbit-escape
Inspirations: Lemmings, Pingus
Download: www.artificialworlds.net/rabbit-escape/#install
Developers: Andy Balaam, CodeSmith00, colonelfazackerley, tttppp

Homepages: www.raceintospace.org, raceintospace
Media: Race Into Space
Inspiration: Buzz Aldrin's Race Into Space
Download: raceintospace/files
Developers: Bart Buyens, Benjamin Weps, Bryant Moscon, Cartmancakes, Erik Anderson, Hendrik W., James, Joseph Wang, Krzysztof A. Kościuszkiewicz, Leon Baradat, Michael K McCarty, Michael McCarty, Nik_akd, Pace Willisson, Petr Menšík, Philip Giuliano, Ryan Schmidt, Ryan Yoakum, Todd Lang, Tushar Maheshwari, Will Glynn, William Sherwin

Homepage: onaluf/RacerJS
Inspiration: Lotus Esprit Turbo Challenge

Homepage: rad-x
Inspiration: Radix: Beyond the Void
Developers: Jim Valavanis, jval1972

Homepages: Archive: 20170915004555/http://radakan.org, radakan
Download: radakan/files
Developers: Taldor, trapdoor, Wombbat

Homepage: GlPortal/RadixEngine
Download: GlPortal/RadixEngine/releases
Developers: Ahmed Hussein, Amir Uqdah, Bowen Yan, Celeste Wouters, Geert Custers, Gus, Henry Hirsch, JulianThijssen, Juraj Oravec, Nilay, Simon Larsen, Stephan Vedder, xantares

Homepages: rails.sourceforge.io, rails
Download: rails/files/Rails
Developers: Brett Lentz, Chris, Chris Shaffer, Erik Vos, Frederick Weld, Freek Dijkstra, Iain, Jason Klapste, Jungy, madoar, Martin Brumm, Michael Alexander, outsidePasser, Stefan Frey

Homepages: Archive: 20170317141245/https://bysusanlin.com/raincat, packages.debian.org/search?keywords=raincat
Developers: Alex Haydock, Mikhail S. Pabalavets, Sergei Trofimovich

Homepage: www.pygame.org/project-Ransack-2408-.html
Developers: Dan Allen, Markus Hackspacher

Homepage: aroldanju/raptor-call-of-the-shadows
Inspiration: Raptor: Call of the Shadows

Homepage: KaeruCT/RaumBaller
Download: f-droid.org/de/packages/com.kaeruct.raumballer
Developer: Andrés Villarreal

Homepage: coelckers/Raze
Inspirations: Blood, Duke Nukem 3D, Powerslave, Redneck Rampage, Shadow Warrior
Download: coelckers/Raze/releases
Developers: alexey.lysiuk, arrowgent, Christoph Oelckers, CommonLoon102, Dino Bollinger, Evan Ramos, Jordon Moss, Magnus Norddahl, Mitchell Richters, NoOneBlood, nukeykt, NY00123, Rachael Alexanderson, Richard C. Gobeille, sinisterseed, sirlemonhead, ‮

Homepage: RobertBeckebans/RBDOOM-3-BFG
Inspiration: Doom 3
Developers: Admer, Andreas Bergmeier, Biel Bestué de Luna, Codes4Fun, Daniel Gibson, Darren Salt, David Foerster, Eric, Jonathan Young, Pat Raynor, r-a-sattarov, Radegast, Robert Beckebans, shawn, SRSaunders, Tobias Frost, Wintermute 0110, Yamagi

Homepage: asiekierka/reconstruction-of-super-zzt
Inspiration: Super ZZT

Homepage: asiekierka/reconstruction-of-zzt
Inspiration: ZZT
Developer: Adrian Siekierka

Homepage: SoupeauCaillou/recursive-runner
Download: f-droid.org/de/packages/net.damsy.soupeaucaillou.recursiveRunner
Developers: Gautier P, Pierre-Eric Pelloux-Prayer

Homepages: www.redeclipse.net, redeclipse
Download: www.redeclipse.net/download
Developers: Alex Foster, Alex George, baby-rabbit, Beha, bonifarz, Dale Weiler, Delph, Edoardo Spadolini, favorito, Fleeky Flanco, freezurbern, Georges Grondin, Henrik Pihl, Hirato Kirata, Hugo Locurcio, Iceflower, Jeroen Boukens, John, jojo, Joshua Blocher, L. H. Lubomír, Lee Salzman, lucky strike, Martin Erik Werner, Maxim Therrien, Mike L., Pocak, quaker66, Quinton Reeves, Robert Alm Nilsson, Robert Forder, shirepirate, stefan, swooboo, Sławomir Błauciak, TheAssassin, ulukai, W!CK3D, zaquest

Homepage: m210.duke4.net
Inspiration: Redneck Rampage

Homepage: nukeykt.retrohost.net
Inspirations: Duke Nukem 3D, Redneck Rampage
Developers: alexey.lysiuk, CommonLoon102, dibollinger, Dino Bollinger, Evan Ramos, fhomolka, Jan, Jordon Moss, MexMeRcUrY, Mitchell Richters, NoOneBlood, nukeykt, NY00123, Pierre-Loup A. Griffais, Richard C. Gobeille, sirlemonhead, Szilárd Biró, ‮

Homepage: OpenDriver2/REDRIVER2
Inspiration: Driver 2
Developers: André Vicente Milack, Ilya, Mark Ludwig

Homepages: rsfs.sourceforge.net, rsfs, Archive: 20080725122954/http://php.scripts.psu.edu/cjh212/redshift
Inspiration: GL-117
Developer: Christian Haag

Homepage: NY00123/refkeen
Inspirations: Catacomb 3-D, Catacomb Adventure Series, Commander Keen Series, Keen Dreams
Developers: Braden Obrzut, keendreams, NY00123

Homepages: regoth-project.github.io/REGoth-bs/index.html, REGoth-project/REGoth/wiki
Inspirations: Gothic, Gothic II
Download: REGoth-project/REGoth/releases
Developers: aaeberharter, Alexander Akulich, Alexander Stillich, Andre Taulien, Andrei Preda, Bude, charlydelta, CommanderJax, Felix Bytow, Francesco Bertolaccini, GigaGrunch, Jan Lukas Gernert, kapitaenzufall, Lena Siess, Markus Obereisenbuchner, Markus Worchel, MevLyshkin, Michael Langfermann, ousnius, PLJohnny, rose27, Sergiy Kukunin, Taler

Homepage: fastrgv/Reliquarium
Download: fastrgv/Reliquarium/releases

Homepage: turican0/remc2
Inspiration: Magic Carpet 2
Download: turican0/remc2/releases

Homepages: wiki.nyrds.net, pixeldungeon.fandom.com/wiki/Remixed_Dungeon
Inspiration: Pixel Dungeon
Download: play.google.com/store/apps/details?id=com.nyrds.pixeldungeon.ml&referrer=utm_source%3Dgithub%26utm_content%3Dreadme
Developers: anunknowperson, DeadDie44, Mikhael-Danilov, Monika, Nathan Wolfe, nima-s, Olexandr Nesterenko, PavelProvotorov, Rodrigo Pan, swooboo, ThEnigma314, Watabou

Homepage: seedhartha/reone
Inspirations: Star Wars: Knights of the Old Republic, Star Wars: Knights of the Old Republic II – The Sith Lords
Developers: Billy Brawner, uwadmin12, Vsevolod Kremianskii, Ziemas

Homepage: www.replicaisland.net
Download: f-droid.org//packages/com.replica.replicaisland

Homepage: leonicolas.github.io/ReQbert
Media: ReQbert
Inspiration: Q*bert
Developer: Leonardo Nicolas

Homepages: rescue.sourceforge.net, rescue
Inspiration: Rescue!
Download: rescue/files
Developer: Yura

Homepage: www.residualvm.org
Inspirations: Escape from Monkey Island, Grim Fandango, Myst III: Exile
Download: www.residualvm.org/downloads
Developers: Aryan Rawlani, Bartosz Dudziak, Bastien Bouclet, Cameron Cawley, Christian Krause, clone2727, d356, dafioram, Douglas Liu, Dries Harnie, Einar Johan Trøan Sømåen, Ender, Erich E. Hoover, Faalagorn, Giulio Camuffo, Hubert Maier, Ingo van Lil, Joel Teichroeb, Jonas Karlsson, Joni Vähämäki, Joost Peters, Jordi Vilalta Prat, Joseph Jezak, Kirben, Marcus Comstedt, Matthieu Milan, Max Horn, mparnaudeau, Ori Avtalion, Paweł Kołodziejski, Pierre de Poulpiquet, Scott Thomas, Stefano Musumeci, Sven Hesse, Thomas Allen, tobigun, Torbjörn Andersson, Vincent Pelletier, Will Thomson

Homepage: cosmin.hume.ro/project/retro-stack-gdx
Download: f-droid.org/de/packages/ro.hume.cosmin.retrostack

Homepage: Archive: 20190630000950/http://zxstudio.org/projects/drdestructo
Inspiration: Destructo
Developer: Max Savenkov

Homepage: www.siedler25.org
Inspiration: The Settlers II
Download: www.siedler25.org/index.php?com=dynamic&mod=2
Developers: Alexander Grund, Flow86, hoffmeistert, jh, Joakim L. Gilje, Johannes Doerfert, JonathanSteinbuch, MarcusSt, Matthias Mailänder, OLiverRttR, Shawn8901, Spike, stefson, Timm Hoffmeister, uqs

Homepages: retux-game.github.io, savannah.nongnu.org/projects/retux
Inspiration: Super Mario
Download: retux-game.github.io/download.html
Developers: Jorge Maldonado Ventura, onpon4, The Diligent Circle 丸

Homepages: ri-li.sourceforge.net, ri-li
Downloads: ri-li.sourceforge.net/download.html, ri-li/files
Developers: Dominique Roux-Serret, Roux-Serret Dominique

Homepage: rickyd
Inspiration: Rick Dangerous
Download: rickyd/files
Developer: Paulo Assis

Homepage: lethal-guitar/RigelEngine
Inspiration: Duke Nukem II
Download: lethal-guitar/RigelEngine/releases
Developers: Alain Martin, Andrei-Florin Bencsik, Nikolai Wuttke, Pratik Anand, s-martin

Homepages: www.rigsofrods.org, rigsofrods, RigsOfRods
Media: Rigs of Rods
Inspiration: BeamNG.drive
Developers: Antoni A., Artem Vorotnikov, Billel Adam, Bruno, Chris Ritchey, Edgar, Hiradur, Joaquin Gomez, Michael, mikadou, Pavel Rojtberg, Petr Ohlídal, pricorde, Speciesx, tdev, Tim Göttlicher, tritonas00, ulteq, Weblate (bot)

Homepage: collinsmith/riiablo
Inspiration: Diablo II
Developer: Collin Smith

Homepage: icculus.org/rott
Inspiration: Rise of the Triad

Homepage: www.moddb.com/mods/robot-redemption
Inspiration: Hovertank 3D

Homepage: rystills.github.io/rock-raiders-remake
Inspiration: Lego Rock Raiders
Developers: Ryan Stillings, Scarabol

Homepage: rockbot.upperland.net
Inspiration: MegaMan
Download: rockbot.upperland.net/?page_id=301
Developers: Farley Knight, Iuri Fiedoruk

Homepage: www.artsoft.org/rocksndiamonds
Media: Rocks'n'Diamonds
Inspirations: Boulder Dash, Emerald Mine, Sokoban, Supaplex
Downloads: www.artsoft.org/rocksndiamonds/download, f-droid.org/en/packages/org.artsoft.rocksndiamonds

Homepages: rogueclone.sourceforge.net, rogueclone
Media: Rogue Clone IV
Inspiration: Rogue
Download: rogueclone/files/rogue%20clone
Developers: Michael Lehotay, Nick Straguzzi

Homepage: rogueboxadventures.tuxfamily.org
Download: rogueboxadventures.tuxfamily.org/download.html
Developer: themightyglider

Homepage: roguesharp.wordpress.com
Developers: Courtney Strachan, FaronBracy, Glenn Hoeppner, James Neal

Homepage: CamHenlin/Roguish
Developers: Cameron Henlin, Jordan Butler, Ryan Wise

Homepage: antionio/game-off-2013
Developers: Antti Kolehmainen, Lee Reilly

Homepage: gamejolt.com/games/rm/41491
Media: dosgames.com/game/magus
Inspiration: Magus
Play online: gamejolt.com/games/rm/41491
Developers: Cong, Kosina Zoltán

Homepage: SaxxonPike/roton
Inspirations: Super ZZT, ZZT
Developers: Ian Burgmyer, Tony Konzel

Homepage: h4mu/rott94
Inspiration: Rise of the Triad
Developer: Tamas Hamor

Homepage: LTCHIPS/rottexpr
Inspiration: Rise of the Triad
Developer: Steven LeVesque

Homepages: www.last-outpost.net/rpg-x, Archive: 20130126113126/http://rpgxef.hennecke-online.net
Inspiration: Star Trek: Voyager – Elite Force
Download: UberGames/rpgxEF/releases
Developers: harryyoung, Walter Julius Hennecke

Homepage: Archive: 20210411074243/https://rpgboss.com
Download: rpgboss/rpgboss/releases
Developers: Caranille, Hendrik Weiler, NothingForgotten, ravedragon, Tommy C. Li

Homepages: www.asahi-net.or.jp/~cs8k-cyu/windows/rr_e.html, rrootage.sourceforge.net, rrootage
Download: rrootage/files
Developer: Evil Mr Henry

Homepage: ryanb/ruby-warrior
Developer: Ryan Bates

Homepage: fastrgv/RufasCube
Download: fastrgv/RufasCube/releases

Homepage: fastrgv/RufasSlider
Download: fastrgv/RufasSlider/releases

Homepage: fastrgv/RufasSwap
Download: fastrgv/RufasSwap/releases

Homepage: runelite.net
Inspiration: Old School RuneScape
Developers: Abel Briggs, Abex, Adam, Alex Kolpa, Alexander Henne, Alexander Lyon, Alexsuperfly, Anthony, AWarbear, Ben Dol, Ben Moyer, Blackberry0Pie, Brady, Broooklyn, Cameron Moberg, Charlie Waters, chivesrs, Crow, Cyborger1, Damen, Daniel, Daniel Bolink, Daniel Teo, DannysPVM, David, Davis Cook, dekvall, Dennis, Devin French, Dominik, Dreyri, Eadgars-Ruse, emerald000, ermalsh, FatalWaffles, forsco, Frederik, Gamer1120, Gamma91, geheur, Gregg, Gustavo Rodrigues, Hannah_GBS, Harry, Henry Darnell, Hexagon, honeyhoney, Hydrox, HypoxiaOSRS, Håkon Rosseland Paulsen, iguana, Infinitay, Jacky Liang, Jacob McElroy, Jeremy Plsek, Jeroen, Jesse Serrao, Jonathan Lee, Joona, Jordan, Joshua Filby, Juzzephe, JZomDev, JZomerlei, Kamiel, kmutchnick, Kronos, Krysa, Kyle Fricilone, Kyle Stevenson, l2-, Lars, Levi, LlemonDuck, ln, ltvill, Magic fTail, Maiddog, Malfuryent, MarbleTurtle, Martin H, Matthew C, Matthew Steglinski, Max Bartlett, Melky, Mitchell Kovacs, Morgan Lewis, Nathen Sample, NotFoxtrot, oplosthee, PandahRS, Rami, RansomTime, raqes, Reasel, rlw0014, Robbie McLeod, Robert McLeod, Robin Weymans, Robin Withes, Ron Young, Ruben Amendoeira, Ryan Bohannon, Sam Beresford, Sander de Groot, Sean Dewar, SebastiaanVanspauwen, Sergz39, Seth, ShaunDreclin, shmeeps, SirGirion, SomeoneWithAnInternetConnection, SoyChai, spatiag, Spedwards, steffenhauge, Su-Shing Chen, superiorser9, ThatGamerBlue, ThePharros, TheStonedTurtle, Tim Granata, Tomas Slusny, Toocanzs, Trevor, trimbe, Twiglet1022, Tyler Hardy, Tyler Nichols, Usman Akhtar, Vetricci, whartd, William, William Collishaw, winterdaze, Woox, xDemoN, xdesr, XrioBtw, Zachary Waller

Homepage: Archive: 20151230145617/https://developer.mozilla.org/en-US/demos/detail/runfield/#
Play online: fhtr.org/runfield
Developers: Mozilla, Paul Rouget

Homepage: yokljo/ruzzt
Inspiration: ZZT

Homepages: wiki.ryzom.dev, Archive: 20160413082305/http://www.ryzomcore.org
Media: Ryzom Core
Inspiration: Ryzom
Developers: Claire, Cédric OCHS, dfighter1985, dnk-88, Gary, Geels12, Guillaume Dupuy, Jan Boon, liria, Matt Raykowski, Michaël Witrant, nimetu, NO-BREAK SPACE OÜ, Riasan, Rodolphe Bréard, Shubham Meena, StudioEtrange, ThibG, Tobias Peters, Ulukyn, Xtarsia