Links:Free statistical software

Portals to free statistical software
John C. Pezzullo's list of free statistical software List of free software StatSci list of free software

List of free statistical software

Impoverished Social Scientist's Guide

Association for Survey Computing software index lists some free stat software, although there isn't a separation between free and commercial, so it's kind of  hard to find the free ones.

Gene Shackman's list of software at gsociology.icaap.org