I looked through the image comparing how communities wrote down their handle.

So I made a list of communities which wrote down their handle:

For a bunch of them I had to look up who posted it, because the handle was ambiguous. Which means in some cases there can be a bigger community of the same name like it’s the case with !gamedev and !rust.

I only list handles that follow the format !x[@tld], x@tld, [tld/]c/x, [tld/]m/x