RSVPify - A powerful and awesomely customizable platform for selling tickets online for your event.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Punchbowl - A party planning and greeting card website
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
Whoozin.com - Free RSVP Online | Track RSVP’s and Sell Tickets for your events and recurring meetings.
Ticket Tribe - Sell tickets online with no fees per ticket