I recently wrote an editor for this:<p><a href="https://mbarkhau.keybase.pub/asciigrid/" rel="nofollow">https://mbarkhau.keybase.pub/asciigrid/</a>
This is cool, except the alignment is wrong in almost all diagrams. Labels are off center, things overlap, etc. If that were fixed, it would be very nice and usable.
Also check out Markdeep, which provides this (and a whole lot more) via JS: <a href="http://casual-effects.com/markdeep/#features" rel="nofollow">http://casual-effects.com/markdeep/#features</a>
Sometimes works with <a href="https://www.asciiart.eu" rel="nofollow">https://www.asciiart.eu</a><p>For example: <a href="https://www.asciiart.eu/cartoons/felix-the-cat" rel="nofollow">https://www.asciiart.eu/cartoons/felix-the-cat</a>