I was surprised to see that Fauna has been near the top of the RubyForge most-active list recently:
Based on a clue from Tom Copeland, I pieced together the formula for project activity. For any given week:
activity = log(0.3 * number of file downloads) + log(number of repository commits) + log(3 * number of bugs filed) + log(3 * number of forum messages posted) + log(4 * number of ended tasks) + log(5 * number of files released) + log(5 * number of support requests made) + log(10 * number of patches filed)
This is then converted into a percentile of all active projects.
It’s interesting that a project can have significant activity even if no developer is working on it.