You can download Stat/Transfer 12.0 for Mac from our software library for free.
From the developer:
Ever had a colleague send you an XYZ file that you wanted in ABC format--say an SPSS file that you wanted in Stata format or the other way around?
Stat/Transfer makes it easy to move data among the different spreadsheet and statistical programs by providing a fast and reliable way to convert files from one format to another.
You may want to check out more software for Mac, such as StatTransfer, which might be related to Stat/Transfer.