Red Hat Enterprise Linux
Commercial enterprise Linux platform with defined support lifecycles.
Archives: Technology Atlas
Mac OS X Server 1.0 and 10.0-10.6
Apple server releases spanning the transition from Rhapsody foundations to Mac OS X services.
Gentoo
Source-based distribution offering extensive compile-time customization.
Arch Linux
Rolling-release distribution emphasizing simplicity and current packages.
Kali Linux
Security assessment distribution designed for authorized testing and training.
Pop!_OS
Ubuntu-derived desktop distribution focused on creators, developers and gaming.
Bazzite, SteamOS and Nobara
Gaming-focused Linux systems package drivers, compatibility layers and console-style workflows.
ChromeOS
Google-managed operating system centered on web, Android and Linux application models.
IBM Unix Platforms
IBM Unix history includes AIX and earlier commercial systems used on enterprise hardware.
AT&T Unix
Foundational Unix lineage that influenced commercial and open operating systems.