pJab
pJab ("private Jabber") was a project I started up a while ago when I wanted to make a Jabber client which ran on Java and could do OpenPGP encryption.
I eventually abandoned it not only from lack of time, but also because Psi started supporting all the features I was going to implement anyway, and to the same level of portability. The only use for my code became bots, and I still have plans of using the OpenPGP compatibility as a form of automatic authentication for my bot.
Another use for the code may well have been J2ME, if I could get OpenPGP crypto working (well) on such a limited system.