Haiku (operating system): BeOS API, OpenTracker, List of programs, Comparison operating systems, BeBits, Free software, Open source ... Self hosting, Software release life cycle

Gobuntu: Operating System, Ubuntu (operating system), Free software

Xpaint: X Window System, Image Editing, Open Source, Free Software, Operating System

MPlayer: Open Source, Media Player (application software), Operating System

XNU: Free and Open Source Software, Operating System, Hybrid kernel, Carnegie Mellon University