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There's a new Topic Maps wiki on the block - TMWiki. It's maintained (in part :) by Hendrik Thomas. He encourages you to contribute.
TMwiki is a Topic Map Wiki application based on Dokuwiki. It enables the collaborated authoring of Topic Map. Also I developed TMV (Topic Map Visualiser) a generic graphical Topic Map browser. It is used in TMwiki as a display and navigation interface for Topic Maps.