Operating Systems - Brief descriptions, screenshots, links, for OSs: Unix, NeXTStep/Openstep/MacOS X/Darwin, Windows 95/98/ME-NT/2000, VMS.
The OS Files - Portal for many x86 PC platform operating systems; details, news, information, secret tips, background, links, availability (current, planned); DOSs, Linux, NetWare, OS/2, Unix, Windows.
TUNES Project: Operating Systems - Over 150 OSs described, mostly original commentary, many deep insights, over 1,000 links. [Open Content]
ALTernative OSes List - Sortable list of dozens of OSs, submission Web form, links. Site source code (PHP, MySQL) is free software. [Open Source, GPL]
Vintage OS - Information, consulting on DOS, Windows, OS/2, Unix, BSD, Mac, MVS, Palm OS, UNIX, and other vintage operating systems.
Information about Operating Systems - Operating System Documentation Project, OSDP: information on many OSs and their developers; independent objective descriptions, facts, history; in text and screenshots. English, Deutsch, Français.
Freebyte's Guide to Operating Systems, Free and Non-free - Includes: open source, commercial; Unix (BSDs, Linux); Amiga; BeOS, Zeta; RiscOS; DOS, Windows-emulators; educational; a few related topics.
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