DotNetNuke is an open-source Web Application Framework ideal for creating and deploying projects such as commercial websites, corporate intranets and extranets, online publishing portals, and custom vertical applications.  

DotNetNuke is provided as open-source software, licensed under a BSD agreement.  In general, this license grants the general public permission to obtain the software free-of-charge.  It also allows individuals to do whatever they wish with the application framework, both commercially and non-commercially, with the simple requirement of giving credit back to the DotNetNuke project community. 

DotNetNuke is built on a Microsoft ASP.NET (VB.NET) platform, and is easily installed and hosted.  With a growing community of over 340,000 users, and a dedicated base of programming professionals, support for DotNetNuke is always close at hand.