Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Potluck - A better way to plan things with your friends
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
ThereOrSquare - Everything you need to plan an epic party with your friends
Ticket Tribe - Sell tickets online with no fees per ticket
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.