SymPy Gamma (https://gamma.sympy.org/input/?i=integrate+x%5E2) sort of fits as an alternative, though it's not very good at parsing general questions/expressions.

Woah! That is very cool indeed. Time to start using SymPy Gamma instead of Wolfram|Alpha. Surprising that their GitHub repo has so few stars. Only 400 stars at the time of this writing. I mean, 400 stars is respectable of course, but seeing how cool this is I think they ought to have a lot more stars.

It even renders equations and graphs not as pixelated bitmaps! I should do this more often to avoid squinting while WolframAlpha-ing.

Just wanted to give a star but I saw the Google-junk and will wait until I know how you need to use Google stuff to use it because I've never read enough about GAE.

In big, bold text in the beginning of the description is the header for "Use Mathics online"

It goes to a website with "NET::ERR_CERT_DATE_INVALID"

Mathematica and Wolfram Alpha are two completely different things, though. The latter is nothing even close to just a web UI for the former.