Visualizing time and geography of open source software with storygraph

Free/Libre and Open source software are generally maintained by a group of developers contributing to the software voluntarily without the presence of any governing institution. Online collaboration platforms and sub-version systems allow developers from all over the world with the necessary skills to contribute to the software. Recently, there has been much interest in analyzing the developers' geographic location since it also serves as a socio-economic marker. In this paper we present our spatio-temporal visualization technique called Storygraph that shows the developers, developer locations and the frequency of commits based on the commit log in one integrated view. We also apply our techniques to the VCS of Rails, Homebrew and D3.js obtained from GitHub.