WikkaWiki is a flexible, standards-compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages. Forked from WakkaWiki. Designed for speed, extensibility, and security. Released under the GPL license.
Lacks available extensions or plugins, and extending functionality requires custom programming.
Management of content and data is relatively straight forward, but there may be a bit of a learning curve. Some programming experience may be required.
Lacks an active community, and there is no or minimal support provided. Lacks proper documentation.