eventup - Find Great Event Venues in the US
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
EventCast - EventCast is an app that helps you schedule events and easily invite participants to subscribe.
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
EvenTurbo - It has a solution for any size of organization, be it a small business, local user group, regional training company or a large organization.
Ticket Tribe - Sell tickets online with no fees per ticket