Jeff Silverman's Operating System Comparison Page Compares 6 different OSs to try to find the 'best' OS: Windows 98/NT4/2000, Linux Redhat6.2/SPARC/Alpha/Itanium, SunOS PC. Medium size, interesting, useful features table, web server graph. System administrator viewpoint. http://www.commercialventvac.com/~jeffs/OS_comparison.html

Vintage OS Information, consulting on DOS, Windows, Calmira; OS/2, Unix, BSD, Mac, MVS, Palm OS, and other vintage operating systems. http://www.vintageos.com/

Operating Systems Brief descriptions, screenshots, links, for OSs: Unix, NeXTStep/Openstep/MacOS X/Darwin, Windows 95/98/ME-NT/2000, VMS. http://junior.apk.net/~qc/comp/os/

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. http://www.TheOSFiles.com/

Server Operating Systems Technical Comparison Begun as 'Server Operating Systems Technical Comparison: how does Rhapsody compare as a server OS'; has expanded to compare and contrast other OSs. Technical and non-technical comparisons, recommendations for varied kinds of content creation. http://www.operatingsystems.net/

TUNES Project: Operating Systems Over 150 OSs described, mostly original commentary, many deep insights, over 1,000 links. [Open Content] http://cliki.tunes.org/Operating%20Systems

ALTernative OSes List Sortable list of dozens of OSs, submission Web form, links. Site source code (PHP, MySQL) is free software. [Open Source, GPL] http://www.altos.tk/

Nemesis Old, original, archival website at Systems Research Group: Networks and Operating Systems; University of Cambridge, Computer Laboratory. http://www.cl.cam.ac.uk/Research/SRG/netos/old-projects/nemesis/