Depends on your definition of “use” but I try to complete as many programming challenges as I can in Befunge, or Funge++ my procedural extension.
I wrote a template engine called Candle that was inspired by Razor, but used CSV files as the view model and wasn’t specific to html. A company I worked for used that all the time for data conversion jobs in a smattering of ways. I originally developed it to take CSV output from one system and project it onto an XML template for upload into another system. Saved the company like $40k in consulting fees and they ended up using it for a whole bunch of stuff.
Wish I still had the compiler for it, it was pretty handy given the amount of data that lives only in spreadsheets...
That sounds incredibly useful, I really hope you got a hefty raise for saving them so much $$
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