Grammarly - Clear, effective, mistake-free writing everywhere you type.
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
GrammarChecker.net - Grammar Checker is an online spell check tool. It effectively works on English sentence correction, Punctuation mistakes of 28 other different languages.
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Musicroamer - A visual Pandora for discovering new music