Mupdf is listed in the Configurations part.

I used mupdf for years. Then I discovered llpp (a wrapper on top of mupdf). I never went back since, this is my favorite pdf reader by far :)

https://wiki.archlinux.org/index.php/Llpp

that is listed under https://vim.reversed.top/confs

also, clicking on a listing gives details about what is vim-like for that item

For some reason that is under the Configurations tab