GLMStat is a Macintosh-based statistical program for analysing generalized linear models. It provides a macintosh interface using menus and dialogs rather than a command-line interface. Features of GLMStat are

spreadsheet style data entry
Normal, Poisson, Binomial and Gamma models with appropriate links and specification of convergence and aliasing parameters
Scatter and Residual plots
Matrix scatterplots
Box and Whisker plots
Frequency distribution histograms
Descriptive statistics
Output of deviance, parameter estimates, residuals and parameter correlations
Saving of data files complete with all model specifications.
printing of data, graph and results.
Allows missing values
Online Help (under the apple menu) and a brief User Manual.
includes example data files for most examples in two of the texts.
Individual licences available for $US25. Site licence $US200. World site licence $US500. Payment in $US through Kagi Shareware.
Upgrades to versions 5.x and 6.x are free.

storage of data columns and results in double precision rather than single precision
added step halving to fitting algorithm to improve convergence (really only needed for the double precision)
Creation of Matrix graphs using a tabbed dialog (as with other graphs)
Improved specification of Lowess parameter
Mac OS X version look and feel is closer to what Apple requires
requires Appearance manager (this means that you will probably need at least 8.1)
Correlation Statistics command gives Pearson correlations
added 95% confidence intervals to estimates
fixed problem with open file errors not being meaningful

Online registration

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Downloads

confidence intervals from profile likelihoods
ability to use other parameterisations other than corner-point
kernel smoothing of frequency distribution plots
Confidence ellipses for scatter plots
Box-Cox transformations, probably display a single variable as a freq dist histogram which dynamically changes as the Box-Cox parameter changes
more applescript to get and set data
more options for specifying graph axis
Display of subset information to transcript and report.