milkypostman/melpa — pull request #1993 by rnkn (2014-09-10 04:01:24+00:00)
Title: Adding recipe olivetti

A minor mode for a nice writing environment, adjusts window margins relative to text body width to keep text sitting in the middle of the window. (Functionality is more or less duplicated from Writeroom-mode, but implemented in a simpler and buffer-local only way.)

https://github.com/rnkn/olivetti

By package author and maintainer.