FUPPES Revisited
So after a bit more Googling, I took another look at FUPPES. The "release" (SVN-578) seems quite a bit more stable. The version I was working with is SVN-634, which is the latest from the author's subversion repository. It still has the mostly the same pros and cons. The stable version doesn't automatically watch directories, though. So the pros and cons balance out again.
I also read on the uShare site that development has stopped there.
FUPPES does seem the most promising out of all of them, but Ulrich Völkel hasn't been doing too much with it lately. There was even a fork of FUPPES proposed in the forums so people want to contribute, but not much has become of that, either. I may try to debug some of the segfaults myself, we shall see...

April 5th, 2011 - 19:02
Wow, are you a developer of FUPPES now?
April 5th, 2011 - 21:52
@Joey
Not a FUPPES developer, but I’m certainly not afraid to dig into code to solve a problem I may be having.