Here's a Linux Journal article that we wrote to describe our first approach to getting Eclipse running on libgcj.
My old, un-updated web page. You can tell its age because I haven't been a Gnome hacker in years.
I wrote GNU Automake, but have since passed on maintainership. Please bother the new maintainers. I was also one of the authors of GNU Autoconf, Automake, and Libtool. I'm still somewhat interested in build tools, and about once a year I hack on Build. Mostly I'm hoping someone else will pick up all or most of the ideas in Build, since I don't seem to be all that motivated to hack on it. I hear good things about SCons; you might want to check it out.
I work a lot on GNU gcj, and also GNU Classpath. I've started a pretty primitive list of interesting Free Java projects -- both real or imagined. Here's a to-do list of tasks to make Eclipse integrate more nicely with free software. I've also recently started work on gcjx, a clean rewrite of the gcj front end. You can find us gcj and classpath hackers on irc at irc.oftc.net #gcj, or irc.freenode.net #classpath.