XMPP-SSH invokes a remote shell from remote entities securely. It is entirely C++.
Write real-time web applications with XMPP, PHP, and JavaScript
Psi+ is a cross-platform powerful Jabber client (Qt, C++) designed for the Jabber power users.
onesocialweb is to enable free, open, and decentralized social applications on the web. Its protocol can be used to turn any XMPP server into a full fledged social network, participating in the onesocialweb federation. The suite of extensions covers all the usual social networking use cases such as user profiles, relationships, activity streams and third party applications. In addition, it provides support for fine grained access control, realtime notification and collaboration.
Brings all XMPP wonders to Drupal, interacting with user via javascript and plain old HTTP. Strophe javascript library is used for handling all javascript gears
Finch is a powerful text user interface instant messaging client based on libpurple, and it comes included in the Pidgin source, the popular GNOME IM client. Finch supports various protocols, including AIM, ICQ, MSN, Yahoo and IRC.