Git Miner – Dig into guts of git history
gitminer.com
gitminer.com
https://code.googol.com/p/gitinspector/
Gource is another tool that gives an interesting overview of the version control history of a project.
Not even https.
It would be rather more interesting to have a tool that processed and dumped git history data, locally, into Postgres, sqlite or whatever with a standard DB schema. Nicely structured, that data would then be readily available for investigation with whatever viz tools you had to hand (d3 and other charting libs, R, Tableau, etc.)
Are you British? As an American, this is one of my favorite esoteric expressions, along with the even more marginal "bog-stock".