XOWA is a desktop application that can read and edit English Wikipedia offline. It displays articles in an HTML browser, and can download images on demand. It can also be used for Wiktionary, Wikisource, Wikiquote, and the non-English counterparts.
Treebeard is a system of CGI scripts that create an open topical forest. This is a community Web site approach that lets each user tend his or her own branch of the tree. It includes the treebeard, treedonly, treeadmin, and treeimage CGI scripts.