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

Ticket19 - Sell tickets for your events with minimal transaction fees.

Ticket Tribe - Sell tickets online with no fees per ticket

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