This is the mailing list for GNUstep, which is a set of frameworks for
developing applications. If you find any bugs that are due to these
frameworks, then please post them (ideally with a reduced test case, but with
some steps to reproduce if not).
If you find bugs that are in applications, then please contact the
maintainer(s) of the relevant applications. Of the applications listed, I only
know of one (GWorkspace) that is maintained by someone who I know reads this
list regularly, and that's because he's ALSO a contributor to GNUstep. Most of
the rest, I'd not even heard of.
In short, you are not contributing, because telling this list about problems
with applications is (from the perspective of the authors of those
applications) little different from telling some guys in the street, or posting
on your blog.