EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Bizzabo - Bizzabo is the world’s fastest growing event tech company. Our holistic Events Cloud empowers marketers and planners to manage, grow and maximize events.

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets