Easy to use and flexible tile map editor.
Tiled is a 2D level editor that helps you develop the content of your game. Its primary feature is to edit tile maps of various forms, but it also supports free image placement as well as powerful ways to annotate your level with extra information used by the game. Tiled focuses on general flexibility while trying to stay intuitive.
Literally useless without saving since you can't even start a map and you have no stored tile sets. Might as well download it for free (name your price). This service would only be good if you're stuck on a Chromebook and want to spend 1/3 of your computer's price to pay for this service (or like crouton to run Linux on your Chromebook)
It's completely useless without the saving feature...
Tiles really work!