See also: Wiki Tools | Exporting from Wiki
A tool that acts on external articles and converts them to a Wiki page. It may go through the text and handle html format (as applicable) and search the wiki database for existing links and puts those in…
Of course this requires the article to be released under the FDL or GPL or any other free license that would permit anyone to apply changes.
TakeDown.NET -> “Importing-To-Wiki”