Glass Bead Software, LLC produces SnapTalk, a cross-platform (Windows & Mac) instant messaging system, which, like its SnapMail product, is a peer-to-peer system that doesn't require a server.
Pricing starts at $16/user for 1-9 users, and quantity pricing is available.
Version 5.1.1 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!