Classified, alphabetic listing of most operating systems, past and present, distributed commercially or reported in English-language literature, platform oriented. From Computer Science 258, West Virginia University.

Huge, comprehensive, alphabetized list of operating systems and OS link sites. All links, no comments.

Alphabetized list of some 500 links to entries that relate to OSs, from FOLDOC (Free Online Dictionary of Computing) at the University of Brighton, BURKS project.

Describes dozens of living OSs, grouped by family similarities. Most are alternatives to Microsoft.

Categorized, large link list of resources on several operating systems: Linux, Windows, BSD, Mac OS X, Unix, Solaris, Palm OS, Symbian, Stinger (SmartPhone), general.

Some 70 OSs that run on microcomputers, PCs. User interfaces in earlier systems are command-line, character-oriented; later systems are mostly GUI-based. List, with brief descriptions, no links. From West Virginia University.

Alphabetized list of many links, OSs, projects.

Links to tutorials, tips, free online how-to guides for BeOS, DOS, Macintosh; POSIX, Unix, Linux; OS/2, Windows 3.x-95/98/Me-NT/2000/XP-CE, mixed. [Knowledge Hound how-to directory]

Alphabetized list, links to many projects.

Loosely categorized list of about 100 links to developer resources for creating OSs, emulators, alternative OSs.

Alphabetized descriptions and links on many operating systems, related issues, research groups, organizations.