Title: O
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OpenTTD
simulation / management
OpenTTD Team
2014 
One Must Fall: 2097
action / fighting games
Diversions Entertainment
1994 
Oolite
simulation / space exploration
Oolite dev team
2016 
OpenClonk
platformer
OpenClonk team
2016 
Orbiter
simulation / flight simulator
Martin Schweiger
2000 
OpenRCT2
simulation / management
OpenRCT2 team
2007 
onEscapee
platformer / run and gun
Invictus Games, Ltd.
1997 
Order of Battle: World War II
strategy / wargame
The Artistocrats
2015 
OpenLieroX
strategy / artillery
OpenLierX devs
2010 
OverKill
shooter / shoot 'em up
Ste Cork
1992 
Office Ninjas
puzzle
Teardown
2004 
Over The Moonlight
adventure
IronEqual
2017