MyNoise - Custom shaped online noise machines. Many Many generic sounds
Sounds of Earth - Listen to relaxing ambient sounds of nature
noice - Emoji Your Friends Can Hear (😃 + 🔊)
Noizer - Ambient sounds like Noisli, but free
Brain.fm - Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.
Noizio - Feeling that the noise of the big city is too much for you to bear?