Zwiki is a free (GPL), easy-to-use, robust, and powerful wiki engine based on the Zope 2 application server.
Zwiki supports a number of wiki markup styles out of the box, including MoinMoin, Structured text, reStructuredText, but allows also to edit pages in LaTeX or wysiwyg HTML. Zwiki can also co-exist with the Plone content management system. The Zope 2 and Zope 3 projects use Zwiki for part of their documentation.
Zwiki also offers email-integrated discussion, an integrated issue tracker, internationalization support, precise access control (using the Zope Application Server's ACL functionality), and
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