Hey HN! Esolang Park is an online visual debugger interface for esoteric programming languages, that I've been working on for the past few months. For every supported language, Esolang Park provides the powerful Monaco code editor, syntax checking, debugging functionality and a visualisation of the runtime state. The core is language-agnostic - a "language provider" only needs to implement the esolang's parser, interpreter and visualisation UI (and some other little stuff).Apart from trying to boost DX for esolangs, the idea is for this to grow into a platform where people can discover and play around with a variety of esolangs without leaving the browser. That's quite far away though - the project is quite early in development and currently only has 5 languages (Befunge-93, Brainf*ck, Chef, Deadfish and Shakespeare).
Happy to hear any feedback (and bug reports too)!