The triangle peg puzzle is a well known puzzle with 15 holes in a triangle, and 14 pegs. This project consists of solvers for that puzzle in multiple languages, to try to get a feel for each language.
A set of MediaWiki extensions and other tools developed for the Twelf wiki (http://twelf.plparty.org) that enable a wiki to naturally incorporate logic Twelf in a number of meaningful and useful ways.