attending.io - Tiny event pages to ask people one question – are you attending? Twitter login.
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
Alf.io - Looking for a solid open source alternative to EventBrite or MeetUp? Discover Alf.io! Keep control your event and your data with Alf.io. Get started today!
Ticket Tribe - Sell tickets online with no fees per ticket
Confetti - Confetti is the all-in-one tool for all your conferences, festivals, workshops and social events.