PostgreSQL

XWiki

"XWiki is a WikiWiki clone written in Java which supports many popular features of other Wikis like:

* Wiki syntax (uses Radeox engine)
* Content management (view/edit/preview/save)
* Version Control
* Attachments
* Rights Management
* Full-text Search

XWiki also has many advanced features that many other wiki engines lack:

* Document Templates to ease creation of common documents.
* Relational Database storage using Hibernate.
* Design Engine for Meta-Data and Forms.
* In-place (inline) editing of form information in pages.
* Powerful programming API in documents (Velocity or Groovy)
* Search API for more detailed searching in the Meta-Data.
* Plugin System in Java.
* Scalability and Performance using J2EE.
* Complete Design Skin System (templates content as well as CSS) have a look to nice websites powered by XWiki
* RSS output and display of external RSS feeds
* Multi-Lingual capabilities
* XML/RPC Remote API
* Portlet Integration
* Integrated Statistics
* PDF Export
* WYSIWYG HTML Editing"

XWiki Features:

XWiki Features Page

XWiki User Screenshot:

XWiki Edit Page Screenshot:

XWiki Demo Link:

XWiki Demo Pages

XWiki Documentation:

XWiki Docs

XWiki Frequently Asked Questions:

XWiki FAQs

XWiki System Requirements:

XWiki System Requirements

XWiki Download Info:

Download Area for XWiki

XWiki Installation:

XWiki Installation Help Guide

XWiki Guides:

XWiki Developer's Guide
XWiki Administrators Guide
XWiki Users Guide

Helpful Resources on the XWiki Site:

XWiki Homepage
XWiki Blog
XWiki Tutorial
The Best of XWiki (skins and more...)
XWiki Mailing Lists
XWiki Contacts
The XWiki Syntax
List of Wikis Comparable to XWiki

Other XWiki Resources:

XWiki Freshmeat Listing
XWiki Sourceforge Page

XWiki License:

GNU General Public License (GPL)

MediaWiki

From MediaWiki Site:

"The Wikimedia Foundation, Inc. is a non-profit foundation registered in the state of Florida which operates Wikipedia (a free encyclopedia in over 50 languages), Wiktionary (a free dictionary), Wikisource (a collection of public domain or FDL-licensed texts), Wikibooks (free textbooks for schools and universities), and Wikiquote (a collection of notable quotations).

All these projects are based on wiki technology: they are open knowledge bases which can be improved by anyone. This is the homepage of the underlying open source wiki engine, MediaWiki, which is developed here on SourceForge via CVS, and is available under the GNU General Public License (the contents of the Wikimedia wikis themselves are licensed under the GNU FDL)."

Features:

Full MediaWiki Feature List

User Screenshot: