It's called EditCHR, get it at the Verge Source: http://www.vergesource.com (Don't remember the link directly to the file...)
Key features:
- Support hicolor sprites
- Can convert old sprites to hicolor
- Now has a clipboard function with 10 memory slots (only for hicolor sprites)
- Three steps undo
- Drag and drop movescript editor
- Resizing sprites, changing max frames, shifting sprites

---

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