Rainy Mood - Rainy Mood is the world's most popular rain simulator. Sleep, study, and relax with the sound of rain.
Blanket - Improve focus and increase your productivity by listening to different sounds. Or allows you to fall asleep in a noisy environment.
A Soft Murmur - Ambient sounds to wash away distraction.
Ambiance - Ambiance© for your Desktop or Mobile Device
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Noizio.Net - Ambient sound mixer for PC (Windows) inspired by Noizio app for Mac/iOS.