Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
QR Code Generator For Developers - A quick API to generate QR codes in your apps
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Link to QR - Free beautiful QR codes
Ticket Tailor - Ticket Tailor is an easy-to-use event ticketing platform that allows event organizers of all shapes and sizes to sell tickets online.
VisualCode - QR codes for everything