NXEngine-evo
Unrated.
Apr 9, 2020 - v2.6.4.01Game/ActionGame
NyanCat
May 29, 2012 - v1.0.0.0Game
O.H.R.RPG.C.E
Oct 24, 2014 - v0.6855.0.01multiple/multiple
O2EM
Jun 25, 2011 - v1.18.0.0Game/Emulator
Oblige
Jan 12, 2015 - v7.04.0.01Utility/FileTools
Octaspire Crates
Jul 13, 2013 - v0.7.1.0Game/LogicGame
Odamex
Aug 4, 2017 - v0.7.git-041217.8Game/ActionGame
OGS Mahjong
Sep 26, 2015 - v1.1.0.01Game/BoardGame
OhBoy - GameBoy Emulator
Unrated.
May 29, 2012 - v1.0.0.0Game/Emulator
OMAPFB fix
Jan 30, 2015 - v1.0.1.0System
OMF-2097
Sep 1, 2014 - v1.0.0.0Game/ActionGame
OMMPC
Dec 27, 2015 - v0.5.4.0Audio
ONscripter
Unrated.
Jul 9, 2011 - v20110619.0.0.0Game/AdventureGame
onscripter-en
Unrated.
Jul 24, 2011 - v1.0.0.1Game/AdventureGame
Oolite
Nov 12, 2017 - v1.86.0.19Game/Simulation
Open Arena
Jul 11, 2015 - v0.8.8.05Game/ActionGame
Open City
Jan 2, 2015 - v0.6.4.01Game/StrategyGame
Open Fodder
Feb 17, 2017 - v1.3.1.05Game/StrategyGame
Open Hexagon
Oct 22, 2014 - v2.0.0.02Game/ArcadeGame
Open Notrium
Sep 9, 2016 - v1.0.0.03Game/ActionGame
Open Quartz (darkplaces)
Aug 4, 2012 - v20120802.0.0.2Game/ActionGame
OpenBOR
Dec 24, 2017 - v2.0.0.2multiple/multiple
OpenDune
Apr 3, 2012 - v0.7.0.0Game/StrategyGame
OpenGGS
Dec 14, 2015 - v0.168.0.01Game/ArcadeGame
OpenGlad
Unrated.
Dec 27, 2015 - v0.9.8.0Game/ActionGame