Calm - Calm.com can help you reduce stress and increase calm.
Sleepy Baby - Help your baby sleep with the Sleepy Baby soundboard.
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Relay - An extension that adds Discord-style chat to every website
Relaxing Soundscape - Design your own relaxing soundscape for relaxation & sleep.
RelaxMyDog - Relaxing music and TV designed for dogs