AshEdit is a map editor for topdown 2D games. It has been used as an in-house tool for many Nooskewl games. It saves a very simple binary map format that is easy to load.
AshEdit has lots of tools for editing maps, including most of the fundamental features of a sprite editor.
Multiple map layers and tile sheets
A pencil tool for drawing tiles that can draw tile groups and pick tiles with RMB
A fill tool with several options (clear fill, non-contiguous, test visible layers, fill with tile groups)
A clear tool for clearing tiles (can clear all layers)
A solids tool that toggles the walkable flag of a tile
A clone tool that clones from the tile sheet
A tool for moving tiles to different layers
Full-featured rectangular and magic wand selection (add, subtract, non-contiguous, test visible layers,) copy & paste
