Brain.fm - Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.
moooodify - Sort your Spotify music by any mood you like and save them as playlists.
Tinnire - Generative music for productive work from home
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.
GetWorkDoneMusic - Music to help focus and get work done.
Deepwork.fm - Minimalistic "radio" with 4 channels