Get it at the Verge Source: http://www.vergesource.com
(I don't remember the link directly to the file...)
Key features:
- Hicolor sprites support
- Convert old sprites to hicolor
- Clipboard with 10 slots (only for hicolor sprites)
- Drag&Drop movescript editor
- Easy sprite resizing and changing total frames
- Kewl interface ;)

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Mythril. I like it with y, so don't try to make me change it to "Mithril".