Mark Wielaard posted this yesterday:
Escaping the Java Trap
A practical road map to the Free Software and Open Source alternatives
For the last couple of years the community has been working to
ensure that developers can create applications using the java
programming language without having to depend on proprietary
software. Today, the free (as in libre) implementations are
already very capable and support a vast amount of functionality
that developers expect from a java-like environment. Important
large applications like JOnAS, OpenOffice.org 2, Eclipse 3 and
Tomcat 5 are known to work. This document provides a road map of
the various projects; how they work together, where they are,
where they're going, and how we make sure that they work well
and are compatible.
http://developer.classpath.org/support/
Thanks Mark, very useful informations.