PETileMapper is available for free here.
Unity 4.3’s 2D additions are welcome. However one major missing component is tile maps. Producing 2D Zelda-like games without this feature is not an option so I’ve created an importer for what I feel is the best solution currently for editing and creating both tile sets and tile maps intuitively and quickly, Pyxel Edit.
Here is a video of what is possible with this tool:
And here is my video on how to use the importer, PETileMapper: