OpenStat is a general purpose statistics package that you can download and install for free. It was originally written as an aid in the teaching of statistics to the students enrolled in a social science program. It has been expanded to provide procedures useful in a wide variety of disciplines. It is not a "finished" product but revised several times a year. The version is denoted by the month, day and year. For example 1.27.08 would indicate a revision released in January 27, 2008. The program is NOT to be used for commercial purposes and there is no warranty implied. Most users check results by hand or compare to commercial packages to which they have access to insure the results are correct.

urls:
http://www.statpages.org/miller/openstat/
http://www.statpages.org/miller/openstat/LINOSTATS.HTML