Ommwriter is a really cool fullscreen text editor.

http://www.ommwriter.com/en/

I find it really useful for writing. I like the way there’s no page at all, just floating text over a background of wintery trees. It makes me feel totally unconstrained and frees me from my usual blank-page-fright. And, it’s free!

Please see this thread:

https://forum.literatureandlatte.com/t/omm-um/6768/1

Oops! Thanks for pointing me in the right direction.