Gregory's Server@ethanjstark @NanoRaptor I once had to debug an application that kept crashing, which timed industrial automation processes (concretely, robots in car factories) in real time in situ using VBA excel. After a week of pulling my hair out over reams of weird vba code it turned out the windows system at the factory site had simply become slow from being windows.
Or that experimental physics group who did all the fourier transforms of their quantum optics measurements in elaborate Excel sheets.
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@quantensalat @ethanjstark @NanoRaptor my advisor had a nightmarish Excel spreadsheet of unknown provenance that he loved to show off to prospective students (and *only* them??) that…acted as a magnetostatic field solver
Some number of cells (maybe it was flexible and you could configure the bounds?) represented the computational domain, and you populated the cells, one symbol for non-linearities (iron) and another for current sources/sinks
then click "step" a bunch of times until it converged