Are there any open source GTO charts?

Advanced Big Blind Defense: 15BBs-40BBs Hand Range Charts Use these ranges w15-40BB Effective Stacks from BB facing a single open raise

Poker post-flop playbook I read their free I don't play much hold'em, but here's a couple sites that offer some free GTO tools

gto poker calculator GTOBase is the ultimate GTO poker app that includes all necessary tools a professional poker player needs to work on a game in one place

gto wizard GTO - or game theory optimum