Looks like someone needs to stand up for Macintoshs here....
FuzzMeasure Pro is one of the few Mac Room (and other) Analysis programs. Typical Mac style, it is very easy to use. However it is extremely competent and stable. Very reasonable pricing also. http://supermegaultragroovy.com/products/FuzzMeasure/
SignalSuite is another very useful Mac offering. As well as every imaginable type of noise and signal, it can generate sines and sine sweeps without the frequency jumps and glitches that DAW plug-ins often have. Useful to zero right into those room modes. http://www.faberacoustical.com/products/signalsuite/
LabMeter, a realtime frequency meter, also instrument tuners and lots more at http://www.rustykat.com/
Best Regards, DanDan