A free online tool that quickly generates a bunch of shops, their inventory, descriptions and stats for everything for sale.
Seeing in the future is one of the hardest things a GM has to do, and yet it's not uncommon to find fantasy games with spells or magic items that give the PCs the power to do precisely that.
Generate a colourfully named random potion with positive and tempory cosmetic side effects with a click of a button.
If Eigengrau's Generator creates an potion shop for you, for example, you'll also be able to randomly generate potions for sale, or a plot hook.
This site generates whole cultures with sample names, foods, clothes and religions.