Think Repl.it, but a simpler version for esoteric languages, with a visual debugger catered to each language, that runs in your browser.
The linked example shows a Brainfuck “Hello world!” program. You can run it and visualize instructions executed in real time, the memory, and the output. You can pause/step, insert breakpoints, adjust the delay after each instruction, and enter user input. There’s also syntax highlighting and checking.
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