At Mix 2009 Microsoft has released the ASP.NET MVC 1.0 and after that Microsoft released the source code of ASP.NET MVC 1.0 source code under the Microsoft Public License (MS-PL). MS-PL is an OSI-approved open source license. The MS-PL contains no platform restrictions and provides broad rights to modify and redistribute the source code. You can read the text of the MS-PL at: http://www.opensource.org/licenses/ms-pl.html.
Now with source code third party developers can also modify the source code according to their requirements and share with developer community. ASP.NET MVC 1.0 is also adopted by Mono project team
Download ASP.NET MVC
Click here to download and install ASP.NET MVC 1.0. You can also install it using the new Microsoft Web Platform Installer V2 – which provides an integrated setup experience for the entire Microsoft web stack.
The ASP.NET MVC 1.0 source code is now available. Scroll down to the bottom of the ASP.NET MVC download page and you’ll find links to both the ASP.NET MVC 1.0 integrated MSI setup, as well as a .zip file that contains the ASP.NET MVC source code. The ASP.NET MVC source code includes a VS 2008 project file that enables you to build it.