StatPlus

StatPlus allows to perform basic types of data analysis and visualizations: descriptive statistics, comparing means, histograms, box-plots, ANOVA, linear regression analysis and a bit more.
The current free version contains only a small portion of features of the desktop app (yet includes all Analysis Toolpak features with some extras) but all the data analysis methods available are fully functional and includes the same options as in the full-grown Mac/PC app.