FlightGear
macOS, Windows, Linux
Dark Oberon
Linux
Digital Paint Paintball 2
Windows, Linux
Linley's Dungeon Crawl
Disk Operating System, Amiga, Windows, and 1 more
Nexuiz
Alientrap
Hedgewars
Android, macOS, Windows
PyChess
Bos Wars
Tremulous
Smokin' Guns
Simutrans
macOS, Mac OS, Windows, and 1 more
Lincity
macOS, Linux
XBill
iOS, macOS, Android, and 2 more
Freeciv
macOS, Amiga, Windows, and 1 more
World of Padman
macOS, Linux, Mac OS, and 1 more
UFO: Alien Invasion
Linux, Windows
FreeOrion
Cube 2: Sauerbraten
Neverball
Android, Windows, Linux
Enigma
Atlantik
Armagetron Advanced
Frozen Bubble
macOS, Windows, Linux, and 2 more
Kobo Deluxe
Unknown Horizons
macOS, Linux, Windows
Chromium B.S.U.
iOS, macOS, PlayStation Portable, and 2 more
GL-117
Blob Wars: Metal Blob Solid
C-evo
Windows
ChessV