Are your users asking if those two clients work with Tiger or if they work with IntelMacs? If they work on older versions of OS X then they probably work on 10.4.x, although there is a chance of weird behavior. As for IntelMacs, the only thing I've heard so far is Java doesn't work under Rosetta.
The sad thing is, zMud being windows only was one of the two main reasons my new computer is a Wintel machine instead of the mac (the other is I wanted a tower, not a macMini/iMac and didn't wanna pay 2-3K for a Dual G5).
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