FilmRevenue.com

Platypus Wiki
Uses RDF, RDF Schema, and OWL to create ontologies and manage metadata.
platypuswiki.sourceforge.net/

GeboGebo - Wiki system
GeboGebo is an open source wiki system based on tdbengine. It is small, easy to set up and administrate and stores all data in a local, indexed database. It can optionally hold all content as static html pages, too.
www.gebogebo.org/

Wiki Wiki Web FAQ
Frequently asked questions about Wikis, how they work, and a history of them.
c2.com/

Project/Open Wiki Engine
An open-source wiki engine integrated with the Project/Open open-source project management system. Written in TCL and running on top of the OpenACS community system.
www.project-open.com/

sfWiki -- a Wiki for SourceForge sites
Implementation with MySQL backend for use on sites hosted by SourceForge.
sfwiki.sourceforge.net/

Elaborate wiki engine
Elaborate is a free wiki engine written in PHP and MySQL available under the GPL
elaborate.sourceforge.net/

net.nemein.wiki
Open source wiki engine written in PHP for the Midgard Content Management System.
www.midgard-project.org/

Particle Wiki
A light PHP/MySQL wiki engine with archived history, search, admin panel and skins (released under proprietary Particle Soft End User Licence).
www.particlesoft.net/

Wacko Wiki
Small, lightweight, handy, expandable, multilingual Wiki-engine based on Wakka Wiki. WYSIWYG editor, easy installer, many localizations, email notification on changes/comments, several cache levels, design themes (skins) support, XHTML compliance, page rights (ACLs), page comments.
www.wackowiki.com/

UseModWiki: SiteList
A large collection of Wikis, short descriptions, updated regularly,
www.usemod.com/