All ages: Calm app - You do have to pay for it but it is not very expensive. It offers guided meditation, sleep stories, and relaxing music. It can also help teach children, adolescents, and adults how to meditate and do deep breathing exercises.
Different Ages: https://www.therapistaid.com/
Different Ages Available: https://www.centervention.com/social-emotional-learning-activities/
SEL Parent Resources for Home
NAMI Basics- 6 weeks parent/caregiver course for parents that have children struggling with mental health symptoms.