CogStat

CogStat is a free and open source data analysis and statistical analyis software which aims to make data analysis more efficient. CogStat selects the hypothesis tests automatically, creates the graphs automatically, displays the charts automatically, displays the numerical results in APA format, and it knows a lot of smart things.

Find more information on its website, in the Quick start tutorial, in a more detailed explanation about the main features, or in the following slideshow: