Soy Statistics is a JavaScript 'command-line' program that lets you perform a variety of mathematical and statistical functions. It's inspired by the R project and uses the Sylvester library for vectors and matrices and the JavaScript shell as an interface.

The program is available at: soycode.com/soystats.html

Also, check out the wiki, where you can download the uncompressed source code, and the documentation, where you can learn about all the functions and see examples. There's also a tutorial that shows some of the neat things you can do.

In addition to its own pre-written functions, Soy Statistics lets you enter or load any valid JavaScript to extend it however you want. Future versions of Soy Statistics will have features that allow you to read data from the web or upload to an account, run more sophisticated functions, and eventually have a menu-driven interface!