dark city (https://github.com/darken33) maybe he wants to import from sourceforge, ansonsten svn import to github
endgame singularity recursive clone (bei anderen auch)
fosslinux.com
holyspirit/lechemindeladam cvs conversion?
http://antongerdelan.net/blog/ (other projects besides TestDrive)
http://directpython.sourceforge.net/
http://hcsoftware.sourceforge.net/jason-rohrer/ (various games there)
http://icculus.org/asciiroth/
http://icculus.org/avp/
http://icculus.org/bitstream/
http://icculus.org/blackshades/
http://icculus.org/d2x/
http://icculus.org/freespace2/
http://icculus.org/freyja/
http://icculus.org/hge-unix/ http://hge.relishgames.com/
http://icculus.org/jugglemaster/
http://icculus.org/jumpnbump/
http://icculus.org/pyddr/
http://icculus.org/tennix/
http://icculus.org/toby/
http://libsdl-android.sourceforge.net/
http://linball.sourceforge.net/
http://lukaszjakowski.pl/ (games apart from uMario)
http://noiz2sa.sourceforge.net/
http://parsec47.sourceforge.net/
http://psyco.sourceforge.net/
http://pyopengl.sourceforge.net/
http://retrospec.sgn.net
http://rrootage.sourceforge.net/
http://sam.zoy.org/monsterz/
http://stratagus.sourceforge.net/
http://tumiki.sourceforge.net/
http://vamos.sourceforge.net/
http://www.celephais.net/fitzquake/
http://www.codeskulptor.org/
http://www.drpetter.se/project_sfxr.html
http://www.fifengine.net/
http://www.ibiblio.org/pub/Linux/games/strategy/ (and all others)
http://www.myandroidonline.com/category/games/
http://www.newbreedsoftware.com/s
http://www.plasmapong.com/plasma-pong/plasma-pong/
http://www.zsnes.com/ emulator/platform
https://appimage.org/
https://blends.debian.org/games/tasks/
https://carrot.soulweaver.fi/#links
https://cocainediesel.fun/
https://empiredirectory.net/
https://empiredirectory.net/index.php/downloads/viewdownload/6-server-software/13-empire-server
https://en.wikipedia.org/w/index.php?title=Etterna_(Game)&action=edit&redlink=1
https://en.wikipedia.org/w/index.php?title=GNU_Backgammon&action=edit&redlink=1
https://en.wikipedia.org/w/index.php?title=Golden_Age_of_Civilizations&action=edit&redlink=1
https://en.wikipedia.org/w/index.php?title=Kdegames&action=edit&redlink=1
https://en.wikipedia.org/w/index.php?title=Minetest&action=edit&redlink=1
https://en.wikipedia.org/w/index.php?title=Simon_Tatham%27s_Portable_Puzzle_Collection&action=edit&redlink=1
https://en.wikipedia.org/w/index.php?title=Simple_Solitaire_Collection&action=edit&redlink=1
https://en.wikipedia.org/w/index.php?title=Super_Tux_Party&action=edit&redlink=1
https://en.wikipedia.org/w/index.php?title=Trigger_Rally&action=edit&redlink=1
https://en.wikipedia.org/wiki/Abuse_(video_game)
https://en.wikipedia.org/wiki/Arx_Fatalis
https://en.wikipedia.org/wiki/AssaultCube prop. content
https://en.wikipedia.org/wiki/Crystal_Space
https://en.wikipedia.org/wiki/GNOME_Games_Collection
https://en.wikipedia.org/wiki/GNU_Chess
https://en.wikipedia.org/wiki/GNU_Go
https://en.wikipedia.org/wiki/List_of_commercial_video_games_with_available_source_code
https://en.wikipedia.org/wiki/MUD#Spread (all there)
https://en.wikipedia.org/wiki/MUD_client (all there)
https://en.wikipedia.org/wiki/No_Gravity_(video_game)
https://en.wikipedia.org/wiki/One_Hour_One_Life
https://en.wikipedia.org/wiki/Passage_(video_game)
https://en.wikipedia.org/wiki/Rigs_of_Rods
https://en.wikipedia.org/wiki/Rocks%27n%27Diamonds
https://en.wikipedia.org/wiki/Scorched_3D
https://en.wikipedia.org/wiki/Seven_Kingdoms_(video_game)
https://en.wikipedia.org/wiki/Sopwith_(video_game)
https://en.wikipedia.org/wiki/StepMania
https://en.wikipedia.org/wiki/SuperTux
https://en.wikipedia.org/wiki/Teeworlds
https://en.wikipedia.org/wiki/Ten%C3%A9s_Empanadas_Graciela
https://en.wikipedia.org/wiki/Tux,_of_Math_Command
https://en.wikipedia.org/wiki/Warmux
https://fedoraproject.org/wiki/SIGs/Games#List_of_games_we_will_NOT_package
https://flathub.org/home (use it for Linux packaging) / https://flathub.org/apps/category/Game
https://freegamer.blogspot.com/2015/11/top-3-open-source-pinball-games.html
https://futurepinball.com/
https://github.com/amerkoleci/alimer
https://github.com/amerkoleci/vortice
https://github.com/Anthonymcqueen21/Pygame---Alien-Invasion
https://github.com/ao-libre/ao-cliente
https://github.com/apsillers/lords-of-the-fey
https://github.com/apsillers/Taggem
https://github.com/ArmageddonGames/ZeldaClassic
https://github.com/assaultcube (https://sourceforge.net/projects/actiongame/)
https://github.com/bitcraft/pyscroll
https://github.com/bitcraft/PyTMX
https://github.com/CatacombGames/
https://github.com/Chluverman/android-gltron
https://github.com/collections/game-engines (only OS)
https://github.com/collections/javascript-game-engines (only OS)
https://github.com/collections/pixel-art-tools (tools)
https://github.com/collections/productivity-tools (maybe for statistical purposes)
https://github.com/collections/software-development-tools (maybe we can apply some of them across the board)
https://github.com/collections/tools-for-open-source (maybe we can apply some)
https://github.com/collections/web-games (only OS)
https://github.com/Cortrah/SpaceOperaDesign, https://github.com/Cortrah/SpaceOperaRuby/blob/master/design/turnstyles.md
https://github.com/cping/LGame
https://github.com/DeflatedPickle/FAOSDance
https://github.com/ErikLetson/torso-ninja
https://github.com/ErikLetson/torso-ninja-2
https://github.com/flathub (all repositories which are games there)
https://github.com/freeboardgame/FreeBoardGame.org
https://github.com/gamearians
https://github.com/grantjenks/free-python-games (check all)
https://github.com/hparcells/cards-against-humanity
https://github.com/IceReaper/DesktopAdventuresToolkit
https://github.com/id-Software/DOOM
https://github.com/iortcw/iortcw (license)
https://github.com/libretro/libretro-prboom
https://github.com/LucKeyProductions/heXon
https://github.com/OpenMandrivaAssociation
https://github.com/opensourcedesign
https://github.com/OSSGames
https://github.com/OSSGames/GAME-SDL-ACTION-Blobwars_Metal_Blob_Solid
https://github.com/PavelDoGreat/WebGL-Fluid-Simulation
https://github.com/pld-linux
https://github.com/saniv/free-game-art/blob/master/foss-copyright-infringement-records.md
https://github.com/search?p=1&q=sunrider&type=Repositories, sunrider
https://github.com/SPC-Some-Polish-Coders/PopHead
https://github.com/the-insulines
https://github.com/theaigames
https://github.com/Tinob/Ishiiruka (https://github.com/shiiion/Ishiiruka, https://github.com/SirMangler/PrimeHack-Updater)
https://github.com/Wargus/stratagus
https://github.com/wesnoth/haldric
https://github.com/xyzz/openmw-android
https://gitlab.com/LibreGames
https://gitlab.com/vgstation/vgstation-old (and vgstation in general)
https://libregamewiki.org/index.php?title=Libregamewiki_talk:Community_Portal&oldid=25410#Some_long_term_ideas
https://libregamewiki.org/Libregamewiki:Suggested_games#Likely_sources_for_more_free_games
https://osdn.net/softwaremap/trove_list.php?form_cat=80
https://packages.debian.org/sid/games/etw
https://pixeldoctrine.com/index.html (more than just slime volleyball)
https://play.google.com/store/apps/dev?id=8387589286898375037 (where is the source, not open source otherwise)
https://pypi.org/project/CherryPy/
https://pypi.org/project/neteria/
https://pypi.org/project/networkx/
https://pypi.org/project/PyAMF/
https://pypi.org/project/simplejson/
https://pypi.org/project/SQLAlchemy/
https://pypi.org/project/TurboGears/
https://pyweek.org/4/entries/ (Ascent of Justice)
https://revolutionarygamesstudio.com/ Trhive
https://salsa.debian.org/games-team/etw
https://scratch.mit.edu/ (https://en.scratch-wiki.info/wiki/Scratch_Source_Code)
https://sourceforge.net/projects/actiongame/
https://sourceforge.net/projects/deng/
https://sourceforge.net/projects/ettu/
https://sourceforge.net/projects/hhexen/
https://sourceforge.net/projects/lgames/files/barrage/
https://sourceforge.net/projects/librecardgame/
https://sourceforge.net/projects/mininghaze/ - download didn't work
https://sourceforge.net/projects/palomino-sim/ (http://www.jimbrooks.org/archive/software/palomino/)
https://sourceforge.net/projects/pixellight/
https://sourceforge.net/projects/realmforge/
https://sourceforge.net/projects/webchess/
https://stabyourself.net/ (all projects there)
https://web.archive.org/web/20150526225753/http://sourceforge.net/projects/mameosx/
https://web.archive.org/web/20150527150705/http://sourceforge.net/p/forge/community-docs/SourceForge%20Games/ (schon erledigt)
https://wiki.debian.org/Games/Unsuitable
https://www.b3dgs.com/v7/page.php?lang=en&section=projects
https://www.bsframework.io/
https://www.fandom.com/topics/games (look for media links, example https://creatures.fandom.com/wiki/Openc2e)
https://www.fosshub.com/about.html
https://www.freegamesutopia.com/
https://www.libretro.com/
https://www.moddb.com/mods/ (search for all)
https://www.openhub.net/ (search for games)
https://www.piston.rs/
https://www.reddit.com/r/opensource/comments/cs6m3y/a_list_of_fossrelated_projects_people_to_follow/
https://www.reddit.com/r/opensourcegames/
https://www.reddit.com/r/opensourcegames/comments/celw6c/top_3_open_source_pinball_games_2015/
https://www.renpy.org/ (also all projects linked there)
https://zope.readthedocs.io/en/latest/
lgdb ask on reddit for archived version
nexuiz - https://github.com/atphalix/nexuiz
nexuiz - https://github.com/OpenMandrivaAssociation/nexuiz/blob/master/nexuiz.spec
nexuiz - https://github.com/pld-linux/nexuiz/blob/master/nexuiz.spec
nexuiz - https://github.com/smlinux/nexuiz
nexuiz - https://gitlab.com/nyov/nyovs-nexuiz
nexuiz - https://gitlab.com/xonlegacy/xonlegacy
pyglet
Quatter
query alternativeto with only open source...
scrape moddb?
wxPython