A free program for Android, by 1RadioNews.com.

Sleep Sounds Mixer- Soothing Sleep Music app is a free and simple-to-use app that contains relaxing and calming sounds to help you sleep.  It also comes with different options for you to choose from like the choice of relaxing, peaceful, or noisy sounds. This app is for anyone to use and it comes with a user-friendly interface. It can be used as background music as you sleep. 

Your stress and anxiety will be reduced before bed thanks to the soothing sleep sounds and rain sounds in this app.