[matsemann]

Similar: https://www.dwitter.net/

Where you get 140 characters to draw using code. (Similar as in the resulting pictures reminded me of dwitter)

[_kb]

https://tixy.land/ is another where the constraints encourage creativity. A lot of these tools are a little like tiny demoscene.

[teruakohatu]

That is really interesting. Pity half of them use a "eval(unescape(escape(x)).replace(/u../g,'')))" with a compressor and decoder function.