Reggie! is an easy-to-use and full-featured level editor for New Super Mario Bros. Wii, created by Treeki and Tempus.

It works on Windows, Mac & Linux.

Download-

Windows
MAC OSX
Source/Linux

FEATURES
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-Terrain editing
-Sprite editing, with over 1,200 properties available
-Entrance editing
-Image display for over 200 sprites
-Background options, with image previews
-Zone options
-Zoom, Grid and Autosave
-Settable level information
-Resizable and interactive level overview
-Location editing
-Cross-platform (Windows, Linux, Mac OS X)
-Open-source (GNU General Public License v2)
-Riivolution loader for custom levels with original discs\

CHANGELOG Release 3
===================
- Unicode is now supported in sprite names within spritedata.xml
(thanks to 'NSMBWHack' on rvlution.net for the bug report)
- Unicode is now supported in sprite categories.
- Sprites 274, 354 and 356 now render using images.
- Other various bug fixes.