Plexamp - A small music player with a number of unique features
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Vinyls - Vinyls is a music player that lets you listen to your music without any complicated setup.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Poolside FM for iPhone - A pool party in your pocket
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