Bitmap Editor:
How else will you "paint" your skins? Must be able to recognize the .BMP format.
eg. MS Paint, JASC Paint Shop Pro, Adobe Photoshop
Text Editor:
For use in configuring the fonts and colors of the Mini-browser and Playlist editor. Also used if you do any transparency.
eg. MS Notepad, MS Word, Corel Wordperfect
Icon Editor:
You will need an Icon editor if you are hardcore and want to edit the cursors and pointers associated with your skin.
eg. NeoSoft Icon Editor, Icon Edit Pro, Impact Microangelo
Zip Compression Tool:
Absolutely necessary to publish your skin. Winamp.com will not accept an unzipped skin.
eg. PKWare PKZip, Galt 123Zip, WinZip