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OpenSupaplex
A Boulder Dash like game
opentoonz
An open-source full-featured 2D animation creation software
OpenTTD
A clone of Transport Tycoon Deluxe
OpenTyrian
A port of the DOS shoot-em-up Tyrian
openxcom
Open-source clone of the original X-Com
OptiImage
Image optimizer to reduce the size of your images
OrcaSlicer
An open source slicer for FDM printers
Otter Browser
A lightweight QtWebKit browser
Otto Matic
Vintage 3D robot rescue game
pad
A freeware notepad program, similar to Apple's Notepad app
Paladin
An open source integrated development environment (IDE)
Palapeli
A jigsaw puzzle game
Pathological
A puzzle game consisting of marbles that roll along paths
Pathological
A puzzle game consisting of marbles that roll along paths
PCManFM
The file manager used by LXDE