[Wayback/Archive] GitHub – src-d/hercules: Gaining advanced insights from Git repository history.
This project, with the command-line tools hercules and labours is on my research list as it can get pretty good long-term insights on project health (the tool is programming language independent).
Especially the half-life of code is a good measurement, as well as the existence of code bursts (hello major version increments!).
This research part is important: [Wayback/Archive] Change Bursts as Defect Predictors – Publications – Software Engineering Chair (Prof. Zeller), by Nachiappan Nagappan, Andreas Zeller, Thomas Zimmermann, Kim Herzig, Brendan Murphy
The Wiert Corner - irregular stream of stuff 