Empathy - Apps/Empathy - GNOME Wiki!
Explain Everything - Explain Everything is an easy-to-use design, screencasting, and interactive whiteboard tool that...
Psi-IM - Psi-IM is a messaging program that is designed for the XMPP network.
Microsoft Whiteboard - The canvas where ideas, content, & people come together.
Gajim - Full featured and easy to use Jabber client
Conceptboard - Instant Whiteboards for Teams & Projects