Opening up Visual Studio and .NET to Every Developer, Any Application: .NET Server Core open source and cross platform, Visual Studio Community 2013 and preview of Visual Studio 2015 and .NET 2015 - Somasegar’s blog - Site Home - MSDN Blogs
▻http://blogs.msdn.com/b/somasegar/archive/2014/11/12/opening-up-visual-studio-and-net-to-every-developer-any-application-net-
Over the coming months, we will be open sourcing the full server-side .NET Core stack, from ASP.NET 5 down to the Core Runtime and Framework, and the open source .NET will be expanded to run on Linux and Mac OS X in addition to Windows.