A Soft Murmur - Ambient sounds to wash away distraction.
zenmix.io - Ambient background sound generator
Rainy Mood - Rainy Mood is the world's most popular rain simulator. Sleep, study, and relax with the sound of rain.
Studiowave - Chillout tunes and inspiration
Noizio - Feeling that the noise of the big city is too much for you to bear?
SoundDrown - Ambient sounds to help you focus, relax, and escape