Single Player Games in Off Topic
I happen to like hub://AirMapster.ShapeShifter, hub://AirMapster.Hog, hub://DDT.Dragonsnot, and hub://DDT.Birdland. I'm probably biased.
Yet Another Space Age Game (er...) by Crispy
Only a few of those are strategy/RPG, and none are completely RPG (which I would love to play a single player RPG on BYOND, but there are none right now).