The Random Dungeon Mapper does just that; creates random dungeons!
This is a simple line drawing mapper, harkening back to the early days when everyone who made maps drew them on graph paper!
They can be generated at html or as pdf (for battlemap printing).
The files determing room descriptions, treasures, and creatures can all be edited in any text editor for you to customize.
Included are creatures, treasures, and traps up to CR5 from the Pathfinder SRD.
So head on over and get it now!