First things first - this is a Pathfinder bundle.
Secondly, the various "Dressing" releases - Wilderness, Dungeon, Urban, as well as the Village Backdrop series are pretty much system neutral and worth the price of admission on their own.
Third. Raging Swan produces good stuff.
Impossible to list everything in this Raging Swan Christmas MegaBundle, so not gonna try. Follow the link to see the listing.
|a small selection of what is included|