Either Mozilla or Galeon (and presumably other Mozilla
derivatives)
are said to be able to use the Blackdown Group's Linux port of
Sun's JRE
plug-in for Netscape Navigator/Communicator. The trick: You need
to add
links from mozilla/plugins to the Sun Java installation
directory.
Open-source alternatives to Sun's proprietary JRE:
Japhar http://www.japhar.org/oji.html
Kaffe OpenVM http://www.kaffe.org/ doesn't appear
to have a Mozilla
plugin version, yet.
Both would speak to Mozilla via the Open Java Interface
spec:
http://www.mozilla.org/oji/