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There is two sections in this article - direct execution (button) and FormulaCalculators. There is also a hybrid type. I think it would be better to have just one list, or maybe a third category of Hybrid calculators. The article lack a lot of different calculators, actually. It should have at least 15 different calculators.
In the formula type, I think some columns are meaningless. Monospace font to example. We could have "editable constants" instead.