You might be interested in XState[0] and its visualizer[1]. It is not drag and drop, but it does provide a nice visualization that can help debug state logic. I

You might be interested in XState[0] and its visualizer[1]. It is not drag and drop, but it does provide a nice visualization that can help debug state logic. I imagine it’s possible to extend it to support visual manipulation and code generation. Project is JS/TS-specific, however. [0] https://github.com/davidkpiano/xstate https://github.com/davidkpiano/xstate [1] https://xstate.js.org/viz/?gist=bbcb4379b36edea0458f597e5eec2f91 https://xstate.js.org/viz/?gist=bbcb4379b36edea0458f597e5eec...