MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Digify - Secure yet simple to use, Digify is the easiest way to track and protect confidential and...
Tiki Wiki CMS Groupware - Tiki Wiki CMS Groupware, also known as Tiki (or TikiWiki), is a full-featured, web-based, multilingual, all-in-one Free/Libre Open Source Software solution. Tiki can be used to create all kinds of web apps, portals, knowledge bases, intranets, etc.
Drooms - Virtual data room software
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Datasite Diligence - Datasite Diligence is the fastest-growing virtual data room software that is efficient and highly secure.