Musicroamer - A visual Pandora for discovering new music
Grammarly - Clear, effective, mistake-free writing everywhere you type.
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.
Music Walker - Explore and play (via YouTube) songs similar to a seed song.
Grammarian PRO3 - Grammarian PRO3 is a feature-rich grammar checker that enables you to write better content without taking assistance from the English teacher.