Habit Building and Productivity

Habitica
Streaks

Journaling

Journal for You
Gratitude Journal

Meditation

Aura 
Insighttimer  (has sleep component)
Stop, Breathe, Think 
Headspace  (has sleep component)
Mindfulness Coach
Simple Habit

Relaxation

Calm  (has sleep component)
Relax Change Create 
Breathe2Relax 
Colorify (a coloring book to destress)

Sleep

CBT-i Coach
Yoga Nidra for Sleep
SleepiO 
Relax Melodies

YouTube

Body Scan Meditation
Progressive Muscle Relaxation
Breathing Exercise
There are also many other similar resources online with different music, voices and methods.

Please Note: Links to external sources are provided solely as a courtesy. I am not responsible for nor do I endorse or warrant in any way any materials, information, goods or services available through such linked sites or any privacy or other practices of such sites.