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R

R is a system for statistical computation and graphics. It consists of a language plus a run-time environment with graphics, a debugger, access to certain system functions, and the ability to run programs stored in script files. R implements a language which is not entirely unlike the S language developed at AT&T Bell Laboratories by Rick Becker, John Chambers and Allan Wilks.

Rweb

A Web interface to R.

Statlets

This collection of of Java applets comes from NWP Associates, Inc. Datasets up to 100 rows, 10 columns can be analyzed for free; anything larger requires a subscription.

Statistcope

Statiscope presents summarizing data and descriptive statistical charts. In the applet you can enter data manually or download data over the Internet. Charts included: Distribution, Probability mass, Density, Box plot, Stemplot. Other features such as hypothesis testing and calculation of confidence intervals are also included. The user interface is responsive and friendly, e.g. Statiscope introduces a new funny way of changing the scale. It is intended both for people learning the concepts of statistics and for practical use by researchers of various kinds. A good thing is that it lets people share data and do independent investigations. It is designed to look like an oscilloscope but is concerned with statistics, therefore the name of Statiscope. Statiscope is also available as a standalone application that has Open and Save menu options. This application runs on most common platforms.

ViSta

ViSta features visual tools for revealing structure in data; for showing the results of statistical analyses; for guiding the analyst through an analysis; and for structuring the analyst's data analysis process. ViSta is designed for a wide range of users, particularly for those learning statistics and for their teachers.

WebStat

WebStat is a statistical software package written in the form of a Java applet which provides routines for statistical analysis via the World Wide Web.