Hello JRDK92, only autotiles are on the "other engines" folder because RPG Maker has its own format for auto tiles. So we placed those apart for users to know which to use, but the rest of the tilesets can be used in any engine.
In other words, you can use the tilesets "houses...", "nature..", "outside_A5", "outside_b_c..." and "town.." on other engines too.