Learn english with this english speaking tutorial written by a native english speaker.
http://www.englishsubject.net/

Search online for word definitions and meanings, also a free scrabble word anagram tool to find all the words from your scrabble hand.
http://www.drwords.com

An article that describes how your vocabulary can be improved by reading more.
http://www.improvingvocabulary.org/improve-vocabulary-quickly.html

The purpose of Abbreviation.biz is to provide you with the meaning of an acronym/abbreviation and then link you to an authorative website.
http://www.abbreviation.biz