Power Nap App - Best napping timer with relaxing sleep sounds

sup - The first creep-free way to see nearby friends

Earth.fm - Earth.fm is a non-profit, growing library of pure, high quality nature sounds from around the world.

Sampld - Sampld is a sound sharing platform where people can share and download sounds for free.

MyNoise - Custom shaped online noise machines. Many Many generic sounds

soundrop - Soundrop is an app that allows you to create your own personalized sound track to keep you focused or relax.