Sitefinity ASP.NET CMS

Sitefinity ASP.NET CMS is a commercial ASP-based content management system.

From the website:

Architecture and Technical Capabilities
* Fully exposed API
* Sub-sites
* Upload of User or Custom Controls
* Support for Multiple Databases
* Support for CSS layouts
* Support for Membership Services
* Multi-lingual Content Integration
* Interface Localization
* Interface Customization
* Addition of external pages to the navigation
* Metadata
* Dynamic links

Content Management & Authoring
* Online Administration
* User Friendly Interface
* Workflow Engine
* Versioning
* Content Sharing and Branching
* Drag-N-Drop Content Editing
* Templates
* WYSIWYG Editor with Spellchecker
* Control Designers
* Control Templates
* Themes / Skins
* Content Tagging
* File Manager
* Upload of Multiple Items and Zip Archives
* Image Resizing
* Geo Mapping
* Microsoft Visual Studio Support
* Export Site as Template
* Hierarchical categories
* Embedded templates

Built-In Applications
* Blogs Module
* Discussion / Forum Module
* Documents and Images Module
* Events Calendar
* FAQ Management
* Graphs and Charts
* Polls Module
* Search Engine
* Site Map
* Video library support
* Data provider for Amazon S3 and Viddler

and so on. Looks pretty complete.

On the pricey side.

Visit Sitefinity ASP.NET CMS