Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
LineUpr - DIY mobile event app creation platform
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
Scala Days App - The official Scala Days App handcrafted by 47 Degrees.