Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

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

AprilZero - A personal dashboard with a lot of metrics and an amazing UI

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

Sherbit - Sherbit lets you visualize stats on your life based on the services, devices and apps you use.

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