Eventee - Eventee is the most beautiful and easy-to-use mobile event app for attendees.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform

Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.

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

QuickBase - Quickbase provides a no-code operational agility platform that enables organizations to improve operations through real time insights and automation across complex processes and disparate systems. ​​