The web's largest searchable dictionary of abbreviations, acronyms and initialisms with over four million definitions in the database.
  http://www.acronymfinder.com  [Site Details]

A list of acronyms hosted by University College Cork, gathered from many sources and submitted by users.
  http://www.ucc.ie/cgi-bin/acronym  [Site Details]

Acronyms and initialisms from a database of over 410000 entries covering computers, technology, telecommunications, and the military.
  http://acronyms.thefreedictionary.com  [Site Details]