Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Visit a City - Create your personal travel guide
pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features
Foursquare City Guide - Foursquare City Guide is a Free to use mobile application that will lead you to the perfect spot anytime anywhere around the world.
Ticket Tribe - Sell tickets online with no fees per ticket
Flamyngo - Create a city guide with help of your friends.