Calm - Calm.com can help you reduce stress and increase calm.
Rootd - Anxiety and panic attack relief for iOS & Android
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Relay - An extension that adds Discord-style chat to every website
RelaxMyDog - Relaxing music and TV designed for dogs
One-Minute Anxiety Helper - Digital coach to help in moments of stress and anxiety