Potluck - A better way to plan things with your friends
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Giftwalker - Free kid's party planning and gifting app
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
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