Wicked is a Wiki for the Horde framework. It uses PEAR's Text_Wiki package
for markup rules, parsing, and rendering. It supports Creole, Mediawiki,
Tiki Wiki, and its own markup engine.

Some of Wicked's features are:

    Configurable markup engine
    HTML, plain text, Latex, reStructuredText output rendering
    Change tracking and revision history
    Full-text searching
    Per-page permissions
    Attachments with versioning
    Wiki synchronization

WWW: http://www.horde.org/apps/wicked/