DotNetNuke is a Web Application Framework ideal for creating and deploying projects such as commercial web sites, corporate intranets and extranets, online publishing portals, and custom vertical applications.

Overview
Fully dynamic web site allows for an unlimited number of Pages
Pages can contain an unlimited number of Content types
Content Management enabled via a standard Web Browser
Build an online Community with Membership Management
Secure your Content using Roles and Permissions
License
Unrestricted Open Source BSD license
FREE use in non-commercial and commercial environment
Extensibility
Modular architecture enables hundreds of third party plug-in Modules
Designer-friendly Skinning engine for total site customization
Multiple database support through Providers
More than 30 Language Packs to support International users
Support
More than 200,000 registered users since Dec 24, 2002
Maintained and supported by DotNetNuke Core Team