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CudaText looks very similar, and it is foss.

CudaText seems to like claiming to be "written in Lazarus", which as far as I can tell, is an IDE and not a language?

Lazarus is, in a nutshell, the FreePascal compiler + a lot of libraries for GUI (among other things) + a nice RAD.

So “written in Lazarus” is a shortcut for “written in Pascal with the Lazarus runtime”.