2 thoughts;

UVMapper Classic (to see if you like it. If you do, it's free. Pro is spendy, but does a lot more)

Wings 3d- has a built-in Uvmapper, and allows you to do some more modeling if you like.
http:www.wings3d.com

Project Dogwaffle- a free image creation program. Supposed to be pretty good.

Project Gimp - a Photoshop clone, free and can also do stuff with texture.
http://www.gimp.org

should get you started.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)