I like to create large tilesets that I can use throughout the production of my game, without having to create a new set for each map. For that reason, I avoid using autotiles wherever possible & save those slots for animated tiles. Don't worry though, I've made lots of autotiles just for you lazy mappers anyway!
The tiles in these sets serve all & more of the flexibility of autotiles &, as far as I'm aware, there is no variant that can't be created from these sets. In most instances you needn't draw on the second layer when you're mapping either.
I've also included sets with transparency for added flexibility.
This set will continue be updated for as long as I can be bothered.
It's unlikely that I'll upload many more Autotiles though.