Correlation and Principal Components Analysis software for Mac

Greetings-
I am looking for Mac software that will compute correlations between multiple variables and perform principal components analysis on the resulting intercorrelation matrix. These would be small data sets, 10 or 15 variables, 100 subjects. I have Excel which could be used for data entry. I Googled it and became glassy-eyed and may have missed the obvious. This is for personal use so I cannot afford large programs like SPSS which is a great program. If there is nothing runable on a Mac, are there packages on the net that one can use?
Thank you in advance, I appreciate your help.
Best,
Rich
Huntington Beach, CA

Hi Limnos-
Thanks for your response. Your links will be excellent for somebody! The first link concerns Principal Coordinates Analysis for Mac which is related to multidimensional scaling, potentially very valuable for someone looking for such a program. The second and third links provide lists of esoteric software statistical packages some of which for Mac which would be highly valuable for scientific and academic users. Sadly, they didn't provide what I was looking for. Still, all three links were excellent, thanks again.
Again, I seek a basic correlation package and a factor analysis or principal components package that is free or affordable. If it ran with Excel that would be a plus.
Thank you in advance,
Best,
Rich

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