Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
attending.io - Tiny event pages to ask people one question – are you attending? Twitter login.
Aventri - Aventri's event management technology has helped thousands of brands globally transform the way they plan and execute meetings and events while tracking and improving their business objectives.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.