XWiki is a WikiWiki clone written in Java that supports many popular features of other Wikis like the Wiki syntax, version control, attachments, security, and searching, but also many advanced features like templates, database and dynamic development using scripting languages (Velocity, Groovy, Ruby, Python, PHP, and more), an extension system and skinability, J2EE scalability, an XML/RPC remote API, statistics, RSS feeds, PDF exporting, WYSIWYG editing, an Office viewer and importer, and a lot more.

This is mostly a stabilization release leading to XWiki 5.1. It adds Sorl search improvements and bugfixes, as the plan is to make Solr the default search engine in 5.1 final. There is also a new Menu Application in the platform (not bundled by default) to help you create navigation menus.

XWiki – Freecode

XWiki 5.1-rc-1-0630_xwiki_5.1-rc-1.png