Calm- this is a free mental health app that teachers can download and help with meditation and relaxation- https://www.calm.com/ 

Happy Teacher Revolution is a group that teachers can join that offers classes and guides on how teachers can prevent mental health issues or can help them with current mental health issues.  -https://www.happyteacherrevolution.com/ 

Greater Good in Education focuses on teacher and student well-being. They provide resources and tips for teachers to prevent burnout. https://ggie.berkeley.edu/my-well-being/