Noisli

One Page application called ‘Noisli’ that allows you to peacefully write content while listening to soothing background noises. The minimal interface also allows you to customize the sounds with ease.

This website has unfortunately been redesigned or gone offline, so I have removed the direct link to it. The screenshot below hopefully preserved enough of the design but if you are really keen to inspect further, try this Archive.org link. FYI: the site was first featured on 03 December 2013.