PurpleWiki is a WikiWikiWeb implementation
derived from UseModWiki that adds several
features and modularizes the code for easier
development. It includes purple numbers (a
system that allows fine-grained linking to
elements in a page), a parser that supports
pluggable output formats and use by other tools
(plugins for Movable Type and Bloxsom are
included), RSS feeds of recents changes, and
transclusion of content between pages managed by
the parser (within and without the Wiki).