The /DiceRollServer; it lets people make dice rolls, recording decisions that might be affected by the result first, keeps the results in a log and lets people link to them from the wiki relatively easily.
The /SignatureServer; it lets you commit to a decision, or tell people you have some secret information, and later prove that the decision you ultimately took was the one you committed to, or the information you reveal is what you had when you first said you had it.
Following a request by email, there is a copy of the ToothyWiki source [here] (in fact, AIUI it's a requirement of the license that I make it available on request..) - it won't necessarily stay up to date, but I'll update it when/if prodded (last updated October 1 2004). The wiki, image server etc. currently use the following modules: [FileCook.pm] - provides simple hacky functionality to store/read complex perl structures like lists of lists etc. [SafeIO.pm] - wraps filecook in hacky locking functionality [Search.pm] - provides indexing back end for page titles (todo: find notes about the implementation which are buried somewhere on the wiki) [TextIndex.pm] - provides general-purpose text indexing back end [PageFetch.pm] - just the page fetching code from usemod, for other scripts to use as a module [backgroundindex.pl] - kicks off indexing in the background when someone saves a page