Habit Building and Productivity

Habitica
Streaks

Journaling

Day One
Daylio
Daily Bean
Five Minute Journal
Momento

Meditation • Relaxation • Stress Management

Aura (has sleep component)
Breathe2Relax 
Calm (has sleep component)
Colorify (a coloring book to destress)
Headspace  (has sleep component)
HealthyMinds
Insighttimer  (has sleep component)
Mindfulness Coach
Relax Change Create 
Simple Habit

Sleep

Bettersleep
CBT-i Coach
SleepiO 
Yoga Nidra for Sleep

YouTube

Body Scan Meditation
Breathing Exercise
Progressive Muscle Relaxation

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.