Suppose the current layer has a tile-based image (e.g. the tileset for a game). This script will transpose all tiles, so that the tile at the position (1,0) will end at (0,1).
Very useful if you have your sprite sheet as a tall strip of frames (one on top of the other), but you need it as a horizontal strip (with frames side-by-side, as required by Game Maker). With this plugin, you can transpose the frames to convert from one format to another.
If somehow I forget to update the script in this page, check also: