Headspace - Meditation made simple. Brilliant things happen in calm minds.
Online Breathing Timer - Breathe to become calm and regain focus
Stop Breathe & Think - Guided meditation for more mindfulness and compassion.
Breathing exercises - Breathing exercises to calm down and practice diaphragmatic breathing.
Calm - Calm.com can help you reduce stress and increase calm.
Box Breathing - Breathe in sync with this to calm yourself down