Habitica - Habitica is a free habit building and productivity application.
Loop Habit Tracker - Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their...
Purp - A smart to-do list and goal tracker app
Google Calendar - Spend less time managing your day & more time enjoying it
HabitBull - HabitBull
Etar - Material design open source calendar for Android.