Nightout - The standard in event ticketing and marketing by NIGHTOUT
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
TicketHarbor - The safer Craigslist for P2P ticket exchanges
Musicroamer - A visual Pandora for discovering new music
Jukely - Go to hundreds of concerts for one monthly fee 💃
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.