Psi-IM - Psi-IM is a messaging program that is designed for the XMPP network.
Server Fault - Server Fault is a Q&A site for system administrators and IT professionals that's free.
Gajim - Full featured and easy to use Jabber client
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
Empathy - Apps/Empathy - GNOME Wiki!
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.