Yes, all of it is open for development. The only thing about mac is that, if you want to distribute apps via the web, you'll need to instruct the user to bypass

Yes, all of it is open for development. The only thing about mac is that, if you want to distribute apps via the web, you'll need to instruct the user to bypass the code signing requirement by right-clicking on the app or DMG and clicking open from there. Getting a Developer ID code signing certificate is only available with a paid developer account.