Breathly - Open-source breath training and relaxation app
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Calmaria - Breathing exercise for you to relax during this rough time
Medito - 100% Free Meditation App that will improve your Mental wellbeing with the help of Guided Meditations, Breathing Exercises, Mindfulness Practices, Relaxing Sounds, and more.
Breathwrk - Science backed breathing exercises
Calm - Calm.com can help you reduce stress and increase calm.