This applet shows how the hypergraph software can also be used to visualize and navigate through a wiki, as long as this wiki supports the Wiki RPC interface, for example http://www.jspWiki.org.
Each node represents a wiki page, if there is an edge from node A to B, this means that A links to B. As soon as you click on a node, the outgoing links from this page are read from the Wiki and rendered as nodes. The color of a node is black if all outgoing links have been read successfully, blue if the node has just been read and not yet checked for outgoing links, green while the links are fetched from the Wiki and red if there has been an error or if this site doesn't exist in the Wiki.
You can drag the grap as usual.