Dungeon Tile Mapper is described as 'From Wizards of the West Coast, the Dungeon Tiles Mapper lets you create tiled dungeon maps online for free through your browser using a simple grid-based editor. Just select your tiles and drag them where you want them' and is a game development tool in the development category. There are more than 10 alternatives to Dungeon Tile Mapper, not only websites but also apps for Windows, Mac, Linux and iPad. The best Dungeon Tile Mapper alternative is Dungeondraft. It's not free, so if you're looking for a free alternative, you could try AutoREALM or PyMapper. Other great sites and apps similar to Dungeon Tile Mapper are Campaign Cartographer, MapTool, Tiamat and MapForge.
It doesn't use tiles, nor allow you to import dungeon tiles