Soundly - Functional music for better sleep, focus and relaxation
Pzizz - Sleep at the push of a button! Now with "Focus"
Forest App - Forest is an app that helps you stay focused on the important things in life.
Brain.fm - Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.
Deepwork.fm - Minimalistic "radio" with 4 channels
SLEEP by Max Richter - Create your own musical sessions to meditate, focus or sleep