They used to have a program called limeShop or something like that and that was the closest thing to spyware for OS X that I know. However there was an uproar of protest and that program was soon removed. If you get the latest version, I don't think it has LimeShop anymore.
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has limewire, kazza (fast track), and more...
It supports all of the file sharing protocols in one app. Good interface. Stable.
LimeWire is anything but stable.
http://www.xfactor.cc/