AcronymGenie
AcronymGenie is a simple desktop program that lets you look up the expansion of a computer acronym, abbreviation or initialism using an offline database. Simply type the first few letters of the acronym or abbreviation you are looking for and the list of acronyms will narrow down to a more... The AcronymGenie database covers most of the computer-related fields including information technology, Internet, chat, programming, software engineering, networking, hacking, graphics, multimedia, audio, video, telecommunications, electronics, embedded systems etc.
http://www.acronymgenie.com/downloads/ag_setup.exe - 636Kb - Download - Screenshot

Desktop Assistant
Desktop Assistant offers instant alt-click access from almost any application to the free online reference resource with English, Medical, Legal, Financial, and Computer Dictionaries, multiple Encyclopedias, Indexes of Acronyms and Idioms, a Thesaurus, and a Literature Reference Library. ... No spyware, adware, or malware of any kind.
http://files.db3nf.com/DA-Setup.exe - 1Mb - Download - Screenshot