I have a mirror of an awk-related gopher hole from an awk fan as sadly the former domain it's offline. Here's the github repo, but the author has nice addons such as a universal awk library with missing functions for awk (tan, bitwise ops...) https://git.sr.ht/~luxferre/

Luckly, the AWK library it's used for a project:

https://git.sr.ht/~luxferre/DALE-8A/blob/master/tgl.awk

Also, there's a solitaire written in POSIX AWK:

git://git.luxferre.top/nnfc.git

His homepage:

https://luxferre.top