Application Vault- PostNuke

PostNuke is a community, content, collaborative management system, a C3MS providing webmasters with a set of tools to build a dynamically generated web site within minutes of downloading the software. It's backed by a team of dedicated, talented developers, designers, and volunteers with years of experience.

• Modular Structure
• Customized Functionality through Third-Party Modules
• Advanced User Group Permissions System
• Multi-language Support (Approximately 36 Language Packs Available)
• Embedded WYSIWYG HTML Editor Activated on Most Text Entry Areas
• Site Search
• Advanced API (Application Programming Interface)
• Focused on High Level of Security
• Easy-to-Use Guided Browser Based Installation
• Easily Change/Customize Your Site's Look/Feel Through Plug-in Themes
• Provides advanced content management features while promoting collaboration, communication and community around the content.

Source: http://www.postnuke.com