I thought I'd go ahead and release my
Java implementation of
Advogato's trust metric. I thought it was a relatively clean (IMHO) interface-based design and I just wanted to share.
Note that I haven't actually used it anywhere though. (I plan to use it in Flup, the website.) And the unit tests are laughable. But as far as I can tell, it works as expected. (The flow network and actual trust metric code are based off old Python implementations...)