Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Yapp - Yapp enables users to create personalized mobile applications for their events, gatherings, and groups.
Iventlist - Create an app for your event in minutes 🎟️
Ticket Tribe - Sell tickets online with no fees per ticket
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.