| 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. |
| Linux Kernel Architecture and Other OS Links | | Categorized, large link list of resources on several operating systems: Linux, Windows, BSD, Mac OS X, Unix, Solaris, Palm OS, Symbian, Stinger (SmartPhone), general. |
| 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. |
| Operating Systems | | 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] |
| Paul Hsieh OS Page | | Loosely categorized list of about 100 links to developer resources for creating OSs, emulators, alternative OSs. | |
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