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Convergence International - The non-Wintel user group, supporting Acorn, Amiga, Apple, ARM, Be, NCs, PowerPC, Psion, Unix and other alternative operating systems. Services include a non-Wintel news summary.

How Stuff Works: Operating Systems - Unbiased enlightening tutorial with impartial description of how OSs work, and many related links.

Internet Operating System Counter - Statistics on Internet OS use, WWW, FTP, and News servers. Over 940,000 hosts checked in this 1999 survey.

Operating System - Growing article, with links to many related topics. Wikipedia.

Operating System Sucks-Rules-O-Meter - The web-based operating system quality and approval metric.

OSNews: Exploring the Future of Computing - Weblog style online magazine on operating systems and computing environments. Daily updates, reader forum with many comments.