The Elements of Style - Strunk and White

The classic reference text for writers:

Oxford Dictionary

Pretty straight-forward - put in a word and get back a definition:

The Free Dictionary

Medical, Legal, and Computer dictionaries along with standard English reference tools:


A few changing topics featured daily, your standard dictionary and thesaurus plus Word of the Day, word games and more:

Roget's Thesaurus

The classic thesaurus we all know and love:

Bedford/St. Martin

Writing exercises in grammar, style, punctuation and mechanics from a leading academic publisher: