Not flow chart, but the closest in terms of UX improvement is live programming. Smalltalk and Lisp have that, as well as JS in the browser. Basically you can ru

Not flow chart, but the closest in terms of UX improvement is live programming. Smalltalk and Lisp have that, as well as JS in the browser. Basically you can run any snippets you run and redefine almost everything. It's quite different workflow from the default Edit-Compile-Run. That's one of the reason people love Emacs. Once you've loaded the software, you can rebuild it from the inside out without ever shutting it down. You think of a feature, you build it directly, piece by piece, instead of creating a new project, etc,...