Boxen
boxen.github.com
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Boxen is your team's IT robot. It's a dangerously opinionated framework that automates every piece of your development environment. GitHub, Inc. wrote the first version of Boxen (imaginatively called “The Setup”) to help employees start shipping on day one. It's configuration management for everyone: Designers, HR mavens, legal eagles, and developers. We believe that development is production, so we value consistency, predictability, and reproducibility over artisanal, hand-tweaked development environments.