Ambien White Noise
Ambie is a small open source application, which offers you a wide catalog of relaxing background sounds with which it can help you concentrate or simply seek tranquility. It is a box with various nature sounds such as rain, birds, a waterfall or a forest, as well as city sounds.
It is a simple and colorful application, although with several utilities. On the one hand, you have a wide catalog of sounds to play the one you like the most, but it also allows you to mix sounds to create a unique one. You will also be able to download the sounds, change the wallpaper and program the reproduction so that it turns off after the certain time that you prefer.