Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
SlideLizard - Powerpoint plug-in for live audience interaction
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Pingo - Optimize images for the web quickly 🖼️⚡
Ticket Tribe - Sell tickets online with no fees per ticket
Imakiku - Imakiku is an audience response system for real-time voting, posting comments, and surveying.