From the site: As long as you adhere to the requirements of the XMPP specs, you should be able to connect to the Google Talk service. Other clients that can connect include [[http://gaim.sourceforge.net/ GAIM]] and [[http://www.ceruleanstudios.com/learn/ Trillian Pro]].
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xmpphp-gtalk is a project that allows users to connect to the Google Talk API via PHP code. It allows users to send messages to people on their friend list and monitor the server. It uses the Yii PHP framework and requires Yii 1.1.10+.