Gigstarter - Gigstarter uses crowd funding to take the pain from arranging events.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Floship - Floship is an international e-commerce order fulfillment, crowdfunding campaign, and shipping service.

Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform

Hop - Spike makes working easier and more efficient. Saving you and your team time, sanity, and a lot of headaches.

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