Ethereal is a 128x128px (16x16 tiles) tilemap editor I made to use in my game, Eternity.
It uses LÖVE as framework and leaf as code core.

You have nine layers to work. You can select which you want to use by pressing the corresponding number. If you press 0 you get the full tilemap, and the editing mode will be disabled.

You can use WASD to move your selection cursor in the tilemap, and the arrow keys to select your tile (from your tilemap source in resources/tilemap.png).
By pressing E you'll add your selected tile at your cursor position, and pressing Q will remove (actually you will be putting the last tile at it, so please keep it empty). Pressing ctrl+q you'll clear the entire layer, so be careful.
You can save your tilemap down to a file (map.txt) pressing ctrl+s.