Cog VM is implemented in Smalltalk, translated to a lower level lang: https://www.mirandabanda.org/cogblog/about-cog/ described as a "joy to work with"—high praise!
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What defines the *feel* of a programming language?
I've heard JS described as "composing lego blocks" due to npm, and Common Lisp with Sly feels like a place you explore (e.g. docs from the REPL).
All PLs have tools though. Which ones set the vibe?
uLisp, a great little lisp for embedded devices, has a helpful page for debugging. It's great to see function tracing and debugging with continuations described *before* print debugging! https://www.ulisp.com/show?19X5
I've seen atom described as 'a text editor for coders'. That is comically broad. It's hard to think of an editor that isn't for coders.