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

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

Ticket Tribe - Sell tickets online with no fees per ticket

Ticket Tailor - Ticket Tailor is an easy-to-use event ticketing platform that allows event organizers of all shapes and sizes to sell tickets online.

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