The Giant Java Tree is a public domain project whose primary aim
is to create a giant Java source tree consisting entirely of open
source.
This is an excellently designed and maintained site.
From the FAQ:
“How can I help out?
“Send email to join@gjt.org.
We need web site developers to help develop the website. We need
graphics designers who want to get their work on a high volume
site. We need documentation specialists to help literarily
challenged programmers with their User Manuals. We need programmers
to contribute source code to the tree. If you want to write some
code, but do not have anything in mind, send email. There will also
be a category of the GJT bug reporting system that will allow
people to submit code suggestions, so you will be able to review
the items in there soon.”