Plum Village - Free mindfulness app w/ Zen Buddhist meditations + teachings
Calm - Calm.com can help you reduce stress and increase calm.
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Brain.fm - Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.
MindFi - Meditate with open eyes. Be productive.
BurnoutIndex - Check your burnout risk. Backed by science, forever-free.