I use XCode to compile stuff and Apple doesn't charge me anything for using the software compiled with it.
Did you really not have the time to open the App Store and type "Xcode"? Really? Hell even if you're not on a Mac type "Xcode" into Google and look at the first result!
Wrong in all accounts.
I think I came out wrong. I know its freely available. However, most people who use it to get anything useful done (iOS apps, mac-appstore apps) end up paying Apple, subscription fees.