So this repo is supposed to be examples of using vf to generate format strings. You can find vf at https://github.com/guyinatuxedo/vf.
backdoor17_bbpwn - 32 bit with alignment and printed bytes
vf_64 - 64 bit binary
vf_pie - 32 bit with value and address bases
pico18_echo - 32 bit leak with "%s"
angstrum_format1 - 64 bit binary