There's a Mozilla contributor (https://github.com/ghacksuserjs/TorZillaPrint/commits?author=Thorin-Oakenpan...) who's been working on a unified fingerprinting test page. It is in-progress here: https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html (code: https://github.com/ghacksuserjs/TorZillaPrint)
I am not sure how this compares to fpcentral, either in current incarnation or in architecture and future ease-of-evolution or ease-of-automated-integration BUT it seems to be pretty handy. I know he is interested in building it out to make it feature-complete.
So if you're working on a fingerprinting bug and you need to code up a test; you might consider putting it in this framework to work towards keeping it all in one place?
-tom