Also from Ignite Realtime is the Whack API which is specifically for building XMPP components
Whack is an Open Source XMPP (Jabber)
component library for XMPP components.
A pure Java library, it can be
embedded into your applications to
create anything from a full XMPP
component to simple XMPP integrations
such as sending intercepting and
acting on certain messages.
