This Goblinist tool allows you to quickly generate random encounters on-the-fly with only a few required inputs. It also displays the XP gain from each kill along with the total XP gained if the players are victorious.
This website generates mundane “pickpocket loot” which is ideal for quickly generating random and potentially interesting items that players can find in the world.
donjon is a popular website that provides a number of random generator options for D&D, Pathfinder, and other general fantasy needs. You can generate things like random NPCs, treasure, dungeons, traps, and items.
Azgaar’s Fantasy Map Generator is a random map generator that gives you the ability to edit and customize it. This gives you a starting point to work off of so your map making can go faster.