What are some good nether, end, and cave gen mods for 1.20.1?

I'm already going to use either BWG or Terralith for the overworld, but if I can't get a good nether or cave biome gen mod, I'll probably just use BYG instead. Content mods are fine but not preferred (like BWG). Id prefer the mods to be separate for nether and end and whatnot, but otherwise fine

Also, what's a nice general structure mod to go along with these mods. Trying to make a nice vanilla+ multiplayer modpack