Microsoft Excel
About
Excel is a spreadsheet tool that you can categorize in the desktop database.
It's a reactive tool (a cell update is reflected in all dependent cell).
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It's funny to pick on Excel these days. It has a lot of quirks we devs find amusing But let's not forget, it's one of the most valuable pieces of software out there in terms of how easy it is for non-developers to get quick-and-dirty ad-hoc analytics And I say that as a SQL guy