Skype is a free program for Mac OS X (as well as Windows, Linux and Pocket PC) that lets you make free calls to your friends all over the world. After you download, register, and install, you plug in your headset, speakers or USB phone to start calling your friends. The calls have good sound quality and are secured with end-to-end encryption. The optional paid SkypeOut service lets you make calls to old-fashioned phone numbers all around the world. Additionally, Skype allows you to transfer files and participate in plain, old-fashioned instant messaging as well.
Version 188.8.131.521 addresses the following:
Skype operates on a peer-to-peer model, wherein users of the Skype network help route other users' calls around the globe, which may consume your bandwidth unexpectedly if the conditions are right. See the Skype Wikipedia article for more information.
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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!