1. Adium: http://www.adium.im . Accessed 1 Sept 2009
2. Pidgin: The universal chat client. http://www.pidgin.im . Accessed 1 Sept 2009
3. The star experiment. http://www.star.bnl.gov/ . Accessed 13 Sept 2010
4. Xmpp standards foundation. http://xmpp.org . Accessed 13 Sept 2010
5. Ejabberd: http://www.process-one.net/en/ejabberd/ . Accessed 2 Sept 2009