[gone35]

Thank you for posting this. It wasn't immediately clear for me what Sage was though, so I'm pasting the project's description from their home page [1] here in case others were confused as well:

Sage is a free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and many more.

Access their combined power through a common, Python-based language or directly via interfaces or wrappers.

Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab.

[1] http://www.sagemath.org/index.html

[Chinasol]

This looks more interesting than the (pricey) Wolfram offering, but they certainly have a weird password fetish if you try to open an account. Never found anything so fierce before, and I just wanted to take a look...

[gone35]

Agree completely. For onboarding tentative users just interested in trying out a product, front-ends should be using email-only or even URL-only authentication instead.