YourHour - YourHour is an app by Mindefy labs through which you can easily overcome with your phone addiction by monitoring your phone usage.
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.
21 Days - 21 Days app enables the user to track their habits to take challenges to adopt good habits.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
iBetter - iBetter app comes up with features to help you in fighting bad habits and developing new habits through your smartphones.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.