Alkarta - Find happenings in your city.
EventsBase - Find the best professional events nearby or globally
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Rally by Eventbrite - Find the best local events and rally your friends to join
Mutronome for iOS - Practice drums with Apple Music
Calendall - Follow the best events online, without leaving your couch.