Habits by Reclaim.ai - Auto-block time on your calendar for all your routines
Habit List - Create good habits and break bad ones with the app that keeps you focused.
2 Minute Habits - Productivity app helps overcome procrastination in 2 minutes
Micro habits: Self-Improvement app - Super charge your self-improvement journey with Micro habits
HabitCoach - Habits to follow from the best life-changing books.
Habitica - Habitica is a free habit building and productivity application.