So i found save game editors for the first 6 ultimas put when it comes to Underworld they mostly say they don't work with the GOG or cd release version. Anybody know of a good GOG underworld save game editor?

out of curiosity, what is it that you are seeking to edit?

It's worth trying some of these. I found one that works at one point, but can't remember which link I used.

http://ultimacodex.com/archive/ftp/programs/

https://archive.org/details/UWEDITOR

https://xsonaragro711.weebly.com/blog/ultima-underworld-save-game-editor