FitMind - Mental fitness & meditation training
Brain.fm - Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.
Calm - Take a break and meditate.
GetWorkDoneMusic - Music to help focus and get work done.
focusatwill.com - Scientifically optimized music to help you focus
Headspace - Meditation made simple. Brilliant things happen in calm minds.