You'll want to elaborate a little on exactly what you're seeking here; "webdesign system"?
Are you looking for tools that would allow you to create and edit (for instance) static HTML web pages?
Or are you looking for a web content management system (CMS) or equivalent (eg: the integrated web-facing services available on OS X Server, or the Wordpress, Drupal, or other available CMS packages) that allows you to (for instance) customize the capabilities and apply themes?
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