Calm - Calm.com can help you reduce stress and increase calm.
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Sound-To-Calm - A stress relief site to stay calm and carry on.
FlowVR - Virtual reality app with highly effective guided meditations
Timeless | Meditation - Personal practice meditation timer with guided instruction and multi-day courses.
Mindist - First meditation creation & practicing app