Icy Juice is a free, open source ICQ client for Mac OS X. The software is architected in such a way as to encourage support for many languages other than English. The author notes, "Icy Juice is still not feature-complete, and the current release is a preview and an invitation for users to express their needs and expectations from an ICQ client and for developers to take part in this open source project in one way or another."
Version 1.0.2 adds/changes the following:
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Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!