FOLDOC is the acronym for Free On Line Dictionary of Computing. It is a complete selfcontained computing dictionary.
From 1985 is has been enhanced with new terms.
Each page contains hyperlinks to other related concepts. It have a very extensive content, it explains acronyms, jargon, programming languages, tools, architecture, operating systems, networking, theory, conventions, standards, mathematics, telecoms, electronics, institutions, companies, projects, products, history, in fact anything to do with computing.