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
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
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.
TicketSource - Free, easy to use online ticketing for your events.