There's no software specifically designed to work with wordpress, but the templates consists of php files, so any php editor would do the trick.
I have worked on my wordpress themes in notepad++ which has worked well for me.
So, how abt the designs then? Isnt there any way to edit the designs as well?
Hello there, I created my Blog using http://www.artisteer.com/. Nice and easy to use and good for basic customisation. Good for beginner's.