Pidgin supports a good number of chat clients :) They lost the battle for a while there when walled gardens went up, but then won later on and regained support.

Pidgin supports a good number of chat clients :) They lost the battle for a while there when walled gardens went up, but then won later on and regained support. https://www.pidgin.im/plugins/?publisher=all&query=&type= https://www.pidgin.im/plugins/?publisher=all&query=&type= No iMessage, of course, but you might find it helpful to see the list of supported clients.