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.
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.
Gramlee.com - Online grammar check, proofreading and copy editing services.