"Although its name sounds like that of a bacterium, Coccinella is a nice cross-platform open source Jabber client. While Jabber, and IM clients in general, are a dime a dozen, Coccinella sports a few nifty features that make it worth considering.
"For starters, Coccinella is refreshingly easy to install. Actually, you don't need to install anything at all: simply unpack the downloaded archive and launch the Coccinella executable. When you launch Coccinella for the first time, a setup wizard helps you to configure the client and create a new Jabber account, if needed..."