Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Javelin - Javelin is an all-in-one mobile app for playing sports.
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
Concourse - Pipeline-based CI system written in Go
Ticket Tribe - Sell tickets online with no fees per ticket
Mutronome for iOS - Practice drums with Apple Music