Non Session Manager
Unrated.
Feb 2, 2016 - v1.2.0.11Audio
NoteCase Pro
Dec 7, 2016 - v4.2.3.1Office
O.H.R.RPG.C.E
Oct 24, 2014 - v0.6855.0.01multiple/multiple
Odamex
Aug 4, 2017 - v0.7.git-041217.8Game/ActionGame
Oolite
Nov 12, 2017 - v1.86.0.19Game/Simulation
Open City
Jan 2, 2015 - v0.6.4.01Game/StrategyGame
OpenRA
Oct 20, 2017 - v1.0.0.05Game/StrategyGame
OpenSCAD
Jun 18, 2013 - v2013.06.0.1multiple
Opsu!
Oct 23, 2017 - v0.16.0.11Game/ActionGame
Origami (scene intro)
Apr 23, 2016 - v1.0.0.2AudioVideo/Player