Hi,
I am working on tile hacking software in-ROM.
It's MacOS (Monterey) based and uses glut from the Xcode install, so it is OpenGL based also.
The software is OSS and available now as goonstilemaker-nes-0.1.20.tar.gz tarball at
http://sf.net/p/goons-programs/
Do read the README and Makefile...