YourHour - YourHour is an app by Mindefy labs through which you can easily overcome with your phone addiction by monitoring your phone usage.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
21 Days - 21 Days app enables the user to track their habits to take challenges to adopt good habits.
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
iBetter - iBetter app comes up with features to help you in fighting bad habits and developing new habits through your smartphones.
Standard Notes - A safe place for your notes, thoughts, and life's work