Open Source Statistical Software Packages
Tired of paying thousands of dollars for statistical software packages. Thankfully, many other statisticians and computer programmers feel the same way and have created a number of very stable and useful statistical software packages that are freely available on the internet.
PSPP
PSPP is an open source statistical package alternative built on the same basic principles and functionality as SPSS or PASW. As an open source alterative, the program is free available for everyone under a GNU license through the Free Software Foundation.
R
R is quite a bit more advanced when compared to PSPP, but with this advancement comes top-of-the-line statistical functionality. R can be programmed to do everything from basic statistical analysis to structural equation modeling. However, R is a complex computer language, so it takes some time to learn. Thankfully, you can download RCommander to make getting started in R much easier.In addition to PSPP and R there are a number of other open source statistical software packages available on the internet. Check out the links on the OTHER list for some alternatives.