Lunar Magic: Super Mario World Level Editor Tool
http://fusoya.eludevisibility.org/
Lunar Magic is an editor made by FuSoYa for Super Mario World editing.
It has many features and is an extremely advanced editor.
[B][U]Lunar Magic WIKI[/U][/B]
Also Here is Yy-chr Program
[B][U]yy-chr TOOL[/U][/B]
YY-CHR is a program that allows you to edit the graphics of a ROM until you see fit.
The tool can edit a large quantity of graphics from various gaming programs ranging from GB to SNES.
[B][U]YY-CHR WKI[/U][/B]