http://producingoss.com/en/
Producing Open Source Software
How to Run a Successful Free Software Project
Karl Fogel
Copyright © 2005-2015 Karl Fogel, under a CreativeCommons Attribution-ShareAlike (3.0) license.
I found sections of this book very helpful in framing the Farm Hack project. I recommend others taking a look - especially around documentation and cultural best practices.
Some excerpts:
From Introduction
"People should feel that their connection to a project, and influence over it, is directly proportional to their contributions."