I have polished and released the source code for a TikZ reference card I created some years ago. (Images attached.)
The card was intended to be information-dense, fitting as much as possible on two sides of paper. It was only meant to be a reminder of syntax, not an explanation of meaning.
The PDF is A4+color but the source can be compiled for letter paper and/or greyscale (see the README).
The suite of macros used for the ‘grid’ layout could be used for other purposes. If there are expressions of interest, and if I have time, I might create a package based on these macros.
Git repository: https://codeberg.org/ajcain/cain_tikzref
Download PDF or source .zip/.tar.gz: https://codeberg.org/ajcain/cain_tikzref/releases














