I am a web designer and I was wondering if you all have or knew of any WYSIWYG software that i could use to give to my customers so they can add pictures or text to their web page, after i created it.

I don't know of anything easy and that will not change your code. I had a customer use the site building tools offered on their hosting account, but it changed the code for flash apps and rendered those pages useless. I'd like to know the answer to the same question you are asking.

The only one I know of that will protect your code is "Contribute" from Adobe/Dreamweaver group.
The client and you must both purchase the software as when you set up the site in Contribute, you can tell the program what changes the client is allowed to make.

Mike...