There's a bunch of lovely gems scattered through the Atom repos. Some of my favorites from a first quick glance:

Biscotto — A CoffeeScript API documentation generator based on TomDoc notation:

http://atom.github.io/biscotto/

React-Coffee — A little glue that makes Facebook's React easy to use from CoffeeScript without having to resort to JSX:

https://github.com/atom/react-coffee

SpacePen: A minimalist view library for jQuery, allowing custom methods, super calls, HTML-building, subviews, and easy event binding:

http://atom.github.io/space-pen/

... and the best bit about this bonanza is that everything is really quite readable. Keep up the good work, Kevin.