Jingle is a XMPP extensions that enables VoIP support for Jabber clients.

A Voip GUI write in C#, based in Tapioca-Voip framework, 100% compatible with Gtalk.

Gossip aims at making instant messaging as easy as possible, while giving users of the GNOME desktop a user-friendly way of keeping in touch with their friends. .

Freetalk is a console-based Jabber client. It features completion of buddy names, commands, and ordinary English words.

Jabbin is an instant messaging program that allows free PC to PC calls using the VoIP system over the Jabber network. Jabbin uses the TINS protocol, which allows a direct connection between two customers and takes advantage of the potential of various protocols. It is compatible with Google Talk.

Wildfire is an enterprise instant messaging (EIM) server dual-licensed under the Open Source GPL and commercially. It uses the leading open protocol for instant messaging, XMPP (also called Jabber).