Doit.im - Doit.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
TaskUnifier - TaskUnifier - Task Management Application
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
The Hit List - Your life is complicated, but managing it doesnt need to be.
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.