Video: Confluence vs TWiki

Confluence provides one place for technical teams to collaborate—create, share, and discuss your ideas, files, minutes, specs, mockups, diagrams, and projects. A rich editor, deep Office and JIRA integration, and powerful plugins help teams collaboratively develop technical docs, intranets, and knowledge bases. Confluence free alternatives are: XWiki, MediaWiki, dokuwiki.
TWiki is a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform, and web application platform. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet, extranet or the Internet.