For stats, we’ll go with the open source and free PSPP stats program. It is very similar to SPSS and even runs the SPSS syntax. Also PSPP has a Mac OS X version and a current Windows version.
Both can be found through links here: http://www.gnu.org/software/pspp/get.html. The Windows version has a simple installer. The Mac version is a bit more involved, and those using Macs should set aside enough time to go through the steps.