You may recall that in 1997, Netscape embarked on a project to rewrite Navigator/Communicator in Java. This project (code named "Xena," but sometimes referred to by the press as "Javagator") was cancelled before completion.

Grendel is the mail-news portion of the Xena project written in Java. Its goal is to be a true cross-platform application with a feature set that satisfies the poweruser.

URL: http://wiki.mozilla.org/Grendel
Licence: Mozilla Public License