Psi-IM - Psi-IM is a messaging program that is designed for the XMPP network.
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
Gajim - Full featured and easy to use Jabber client
Chatib - Chatib is an online chat room where you can meet and chat with new people, make them friends, or even data them online.
Empathy - Apps/Empathy - GNOME Wiki!
Qudo – Find Snapchat Friends - Qudo is a great app that helps you Find Snapchat Friends directly from your iPhone.