Procedural Dungeons Unity Toolkit released
This asset procedurally generates dungeons and mazes in Unity at runtime. It can build the physical mazes from either tiles that make up the walls, floors, and ceilings, or from prefabs of every room type. It also can procedurally populate the maze with objects attached to the walls, floors, and ceilings.
Check it out here on GitHub: https://github.com/Legorobotdude/ProceduralDungeons
The asset is under the MIT license, so everyone is free to use it in their projects.