Sound Ghost has some really interesting packs! Thanks for the recommendation. I love that they make packs for various hardware too, that’s really neat.

I have the Sample From Mars collection as you mentioned. They often make it really affordable. Some of the packs in there are my favorites, though, mostly for one shots.

As you mentioned though, I am mostly looking for playable multisampled libraries, and Kontakt is an obvious reference. I do not wish to use it for various reasons, but it’s true that one of its strength seems to be its wide adoption.