One of the most rapidly growing professional social networks is GitHub, an online space to share code. GitHub is based on free and open-source software called Git, a version control system used in many digital projects, from library websites to government data portals to scientific research. For projects that involve developing code and collaborating with others, Git is an invaluable tool; it also creates a backup system and structured documentation. In this article, we examine version control, the particulars of Git, the burgeoning social network of GitHub, and how Git can be an archival tool.