Computer Security Resource Center Maintained by NIST's Computer Security Division (National Institute of Standards and Technology).
Free On-Line Dictionary of Computing FOLDOC is a searchable dictionary of definitions, acronyms, jargon, history, facts, and more.
Help-Site Computer Manuals Directory of websites providing documentation, FAQs, tutorials, manuals, and official and unofficial support sites for DOS, Linux, Mac, Unix, Windows, and more.
Programmers Heaven Over 29,000 files, links, and articles. Covers programming languages, platforms, applications, web development, and more.
Webopedia An online dictionary and search engine for computer and internet technology.