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

XAgo - Keep track of repeated events in your life using this iOS and Android application

Momentum - Agile goal and performance management

Habitica - Habitica is a free habit building and productivity application.

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

everyday.app - Every day, it gets a little easier. But you gotta do it every day, that's the hard part.