A Catalog of Operating Systems
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.
Alternative OSs on the Net
A list of operating systems and OS link sites.
Microcomputer Operating Systems
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.
Open Source Ring
Alphabetized list of many links, OSs, projects.
Paul Hsieh OS Page
Loosely categorized list of about 100 links to developer resources for creating OSs, emulators, alternative OSs.