This looks like an open source alternative to Mathematica/MathLab/Maple running in the browser.
Please correct me if I'm off...
As there's no project description that I quickly found, I came to this conclusion myself.
>> This looks like an open source alternative to Mathematica/MathLab/Maple running in the browser.
Yes. If you're on Linux try out wxMaxima as a local app. I'm not sure how to get the Windows version of wxMaxima since you end up in some weird sourceforge hell trying to get an installer.
Wikipedia writes: Maxima is based on a 1982 version of Macsyma
Perhaps because it has such a long history and because this was published in a Lisp website, Maxima was considered known.