Linux
Linux distros, software, tweaks, etc. If it's Linux, post it here.

Mac
Apple software: Apple DOS, ProDOS, System 1-7, OS 8, OS 9, MAC OS X, OS X, macOS, etc. Talk about any Apple software or operating system here.

Windows
Windows 1.0,-3.0/3.1, Windows 95, Windows 98, Windows ME, Windows NT 3.1-4, Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8/8.1, Windows 10, Windows 11, and software for those systems.

DOS & Other
DOS, AmigaOS, BeOS, OS/2 WARP, UNIX, Temple OS, eComStation, eComStation. Plan 9, Haiku, KolibriOS, ReactOS etc. Discuss any other OS and whatever software works on them.