Dormio is described as 'helps you sleep easier and more deeply so that you wake up feeling refreshed and alive. Dormio is great for lucid dreaming, insomnia, and restlessness' and is an app in the Education & Reference category. There are more than 50 alternatives to Dormio for a variety of platforms, including Android, iPhone, iPad, Online / Web-based and Mac. The best alternative is Blanket, which is both free and Open Source. Other great apps like Dormio are A Soft Murmur (Freemium), Tide (by Moreless) (Free), Noizio (Paid) and Rainy Mood (Free).
ANoise is a minimal ambient noise player to help you focus on your productivity! Just open the Ubuntu sound indicator and choose your noise: Coffee Shop | Fire | Forest | Night | Rain | Sea | Storm | Wind