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

eXo Platform - Digital workplace solution

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

Basecamp - A simple and elegant project management system.

Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.

Slack - A messaging app for teams who see through the Earth!