[Math] What are some of the Websites/web-tools which must be a part of every mathematician’s arsenal

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What are some of the web-tools which must be a part of every mathematician's arsenal? Tools which help mathematicians research, solve problems or even collaborate together!

Here is a list I gathered. Many among you may already know these, But still, in case.

  1. MathQuill
    This is a great website for easy typing in LaTeX.

  2. Integral calculator and the Derivative calculator— Especially useful when one wants to crack a tough indefinite question. Steps included for those who need them!

  3. OEIS–A list of all mathematically interesting sequences that contains over 3 million of such. Many things are discovered thanks to OEIS.

  4. Desmos–One of the best online graphing tool with loads of computing power.

  5. WolframAlpha and Mathematica— Who doesn't know them! A unique engine for computing answers and providing knowledge.

  6. MATLAB–Math. Graphics. Programming.
    Whether you’re analyzing data, developing algorithms, or creating models, MATLAB is designed for way you think and the work you do.

Software such as Maple, MATLAB, Mathcad, Pari/GP, R, and the WolframAlpha website, etc are famous, and this question is not asking for similar software alternatives.

I haven't added math stack exchange to this list for obvious reasons :~)

Thanks in advance to all for the over-enthusiastic help 🙂

You might want to check out
Online tools for doing symbolic mathematics


PS-No intention of advertisement or promotion of any website or software.

Best Answer

Quiver lets you draw commutative diagrams easily and export to $\LaTeX$, and MathPix Snip lets you convert screenshots of equations to $\LaTeX$. Both very useful.

Also, libgen and scihub are indispensable with the modern publishing system...