Gnoosic - Even if you don't know what you are looking for - gnod will find it.
Startup Notes - Most actionable advice from each Startup School speaker
Musicroamer - A visual Pandora for discovering new music
Whimsical - The visual workspace for teams.
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.
Standard Notes - A safe place for your notes, thoughts, and life's work