Actually something that just came to my mind and something I've never encountered before. Are there any settings or systems centering about dystopian worlds, but without technology, nothing more complex than average D&D campaign?
For example, an enormous city, surrounded by even larger tracts of farmlands, with all of this surrounded by high walls. City governed by self-appointed Court of powerful (or many) wizards/priests. No one remembers times before The Isolation, people don't go out at night, as then strange monsters reign and devour strays. The Court keeps everyone in control, disallowing most of the fun, and people live their lives day by day, working on farms, trying to survive, making arms, playing cards, and so on.
Some scenarios along this lines.