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0 A.D.
strategy / real-time strategy
Wildfire Games
3059: The Beginning
RPG / roguelike
Phr00t
Abuse
platformer / run and gun
Crack dot Com
Alien Arena
shooter / first-person shooter
COR Entertainment
Alien Swarm
shooter / run and gun
Valve
Angband
RPG / roguelike
Angband Development Team
Armoured Commander
strategy / turn-based tactics
Gregory Adam Scott
AssaultCube
shooter / first-person shooter
Rabid Viper Productions
Battle for Wesnoth
strategy / turn-based tactics
David White
BZFlag
shooter / first-person shooter
Chris Schoeneman
C-Evo
strategy / 4X
Steffen Gerlach
Cataclysm: Dark Days Ahead
RPG / roguelike
Kevin Granade
Cube 2: Sauerbraten
shooter / first-person shooter
Dot3 Labs
DROD: Architects' Edition
puzzle
Webfoot Technologies
Dungeon Craft
RPG / old school RPG
Dungeon Craft Team
Dungeon Crawl Stone Soup
RPG / roguelike
DCSS Devteam
Endless Sky
action / space exploration
Michael Zahniser
Enigma
puzzle / tile-matching
Enigma dev team
FlightGear
simulation / flight simulator
FlightGear team
Freeciv
strategy / 4X
The Freeciv project
FreeCol
strategy / 4X
The Freecol Team