Excellent Knowledge Base resource on the net! ittoolbox.com
Java Knowledge Base

Tomcat Plugin for Eclipse!

Eclipse ready for J2EE!

Ximian

Excellent GNOME replacement desktop for Linux!

Itz free and its very good. Defly have a try!

Itz very easy to install but you must have a good bandwidth (DSL or cable) for a faster download since its 200 MB!

Echo
Really echos everywhere!

J2EE stuff

Jabber -- yet another jargon?