@temporal What's this glamorous toolkit thing?
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A Smalltalk (Pharo) IDE that supports a philosophy they call "moldable development", see https://gtoolkit.com/docs/moldable/.
It's deeply integrating together image-based development, "coding in debugger", computational notebooks/literate programming, rich visualization of data, querying through code structures, writing your own visualizations, etc., in a single environment that lets you sclupt and disect your system, while evolving the environment to fit it like a glove.
