A Persistent System in Real Use - Experiences of the First 13 Years https://tunes.org/wiki/eumel.html (amazing OS where even processes are persistent)
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Another Emacs user learning more about git thanks to magit! I've had similar experiences. https://twitter.com/AMalabarba/status/910817171584028672
A lisper shares his experiences with writing a project in Smalltalk: https://emacsninja.com/posts/one-of-those-who-can-type.html (though using GNU Smalltalk, so no live IDE)