Zown - The Amsterdam based app designed for meeting people face to face in a matter of minutes.

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.

Yaguara 🐆 - Harness the power of your data

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

Guestboard - Lead powerfully-organized group events with Guestboard – a modular event platform that gives groups of 10-1000+ people a central space to coordinate, build excitement, and save money. No more crazy email threads. No more massive group texts.

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