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

The Hit List - Your life is complicated, but managing it doesnt need to be.

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

Todo.ly - Todo.ly is an intuitive and easy to use online Todo list, and Task Manager. It helps you to get organized, simplify your life, and to get things done. Create todo lists, and manage them online from anywhere.

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.

Doit.im - Doit.