Moodwill is a free web app made by a nature lover. It provides high quality sounds of the nature online without requiring any download. Moreover, you can listen to any music you'd love to hear on top of the nature sounds for a better experience.
Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
Defonic - Create a unique sound environment at home or in the office
Noizio - Feeling that the noise of the big city is too much for you to bear?
A Soft Murmur - Ambient sounds to wash away distraction.
SimplyNoise - Thousands of people from around the world use SimplyNoise to block distractions, enhance privacy, aid sleep, mask Tinnitus, and melt away stress. The benefits of color noise have been utilized in clinics, schools, households, and offices.
zenmix.io - Ambient background sound generator