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I've done this with MovableType.
I make a template using my site design and edit the content portion of the page. This can be good for one page, or a series of pages.
On one site I use it to run the News section. Anyone can use the online WYSIWYG editor to add or edit news stories and publish to the site.
Wikiarea still requires a back end to operate like that. You need a system of some sort to edit the data on the pages. Whether you run the scripts yourself or rely on a third-party you'll need to run something to get that functionality.