Habit List - Create good habits and break bad ones with the app that keeps you focused.

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

Momentum - Agile goal and performance management

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

Streaks - The to-do list that helps you form good habits.

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