Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Airbnb - Book unique places to stay and things to do.
Zoho Backstage - Plan, run, and analyze your event— all from one place
Sporteventus for iOS - The worldwide search engine for sporting events and tickets
Meetup for iOS and Android - Discover groups that are all about the things you love
Up All Night - Concerts and exclusive events for $25 a month