Free Online Dictionary of Computing

This site, from the Imperial College, London, Department of Computing, presents the Free Online Dictionary of Computing, which includes "definitions of acronyms, jargon, programming languages, tools, architecture, operating systems, networking, theory, conventions, standards, mathematics, telecoms, electronics, institutions, companies, projects, products, history, in fact any of the vocabulary you might expect to find in a computer dictionary." The keyword search box makes it easy to find the term you seek, simply type it in.