The Lua programming capabilities in LuaLaTeX greatly expand what is reasonably possible within .tex
files. I stumble across examples of cool LuaLaTeX-only code and packages here and there on the net, but have yet to see a dedicated showcase of what LuaLaTeX allows one to do.
I think it would be great to put together a collection of cool LuaLaTeX snippets and packages, to help show what can be accomplished with it, encourage people to try it, and inspire people to give LuaLaTeX a shot and see what they can do with it.
So, let's have it — please submit the most impressive LuaTeX snippets and packages you've made or come across!
This has been closed as a duplicate of What is a simple example of something you can do with LuaTeX?, however "simple example of doing something with LuaTeX" is quite distinct from "showcase of the coolest things that have been done with LuaTeX", in the same way that "showcase of LaTeX typography" is distinct from "example of simple typography in LaTeX".
chickenize
is always a source of good, clean fun.