TuDee!

Tiled is a general purpose tile map editor. It's built to be easy to use, yet flexible enough to work with varying game engines, whether your game is an RPG, platformer or Breakout clone. Tiled is free software and written in C++, using the Qt application framework.

Drag and drop tile based mapping program. Multiple layers, create and import your own tilesets, scale for printing and many more features.