As part of being an open source company, Adafruit provides the design files for all Adafruit designed printed circuit boards (PCB). These are provided as Eagle CAD files and hosted on GitHub.
This guide shows you how to find, download, and view these files. It also shows how to perform some commonly requested tasks, like extracting a designed part for use elsewhere.
This guide is not meant as a way to learn Eagle CAD. Only very basic usage is covered here. For more in depth coverage of Eagle CAD usage, checkout these guides: