Microsoft Translator - Microsoft Translator is your door to a wider world.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Reference.com - Reference.com is the #1 question answering service that delivers the best answers from the web and real people - all in one place.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
WhiteSmoke - WhiteSmoke software products for writing and language. WhiteSmoke is a grammar checker, spell checker, style checker and more - in a single package. Also featuring translation software and English video courses.