Blanket - Improve focus and increase your productivity by listening to different sounds. Or allows you to fall asleep in a noisy environment.
Insight Timer - Support your meditation practice through a massive community powered app.
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Meditation Assistant - Feature packed meditation session timer and recorder
Brain.fm - Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.
Headspace - Meditation made simple. Brilliant things happen in calm minds.