Empathy - Apps/Empathy - GNOME Wiki!
Zeplin - Collaboration app for UI designers & frontend developers
Psi-IM - Psi-IM is a messaging program that is designed for the XMPP network.
Pamela for Skype - A versatile and easy to use Skype audio and video recording software. Features
Gajim - Full featured and easy to use Jabber client
ActiveWords - Auto correct on steroids