tile-mapper

LDtk (Level Designer Toolkit) is a modern and open-source 2D level editor, specifically designed for indie devs.

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.