Bots for doing useful things in wikis.
Pricebot updates exchange rates and crude oil prices in a wiki. Read more about it at http://www.subsurfwiki.org/wiki/User:Pricebot
Linknet creates a DL file containing the edges in a graph of wiki pages, to show how they're linked. Visualize in Gephi.
Catedit edits the pages in a category.
Patrol checks new pages for certain criteria and returns a reverse-ranked list of pages. In early development.