Acronym Definitions
searchable database of acronyms and abbreviations. Definitions are sorted by topics and alphabetically. New abbreviations can be added if they exist and widely known.
http://www.all-acronyms.com/

AriaDic.Com - Best Online English / Farsi Dictionary
The Best and Newest English / Farsi Dictionary Free, Searchable English-Farsi and Farsi-English dictionary with more than 600,000 words.
http://www.AriaDic.Com

Internet Glossary - definitions of IT terms
A glossary of computer and Internet terms with definitions that are easy to understand
http://www.internetglossary.info

Yet Another Web Dictionary
Yawiktionary AKA Yet Another Web Dictionary is a unique robot powered wiki / dictionary. The robot has knowledge on a wide array of topics and information. Come and check out Yawiktionary.com
http://www.yawiktionary.com