What free/cheap and EASY web design software do you recommend?

What free/cheap and EASY web design software do you recommend?
My boss is passing the torch of maintaining and designing our website on to me. We already have a host/provider, so please no suggestions that I set up a site through Yahoo or Google. What I need to know is what kind of software exists that will allow me to easily create web pages for any platform. I've heard of Microsoft Frontpage and am considering it, but I'd also like to know what else is out there.

Also, I'm a PC person, and my boss built the original site on a Mac. Please take that into consideration. And, if you don't mind, speak in terms that those of us who aren't computer whizzes can understand.

_______________________________________
Cheap Website Design