ASP.NET Core is a new open-source and cross-platform framework for building modern cloud based internet connected applications, such as web apps, IoT apps and mobile backends. ASP.NET Core apps can run on .NET Core or on the .NET Full Framework. You can learn more about it [here.] (https://docs.asp.net/en/latest/intro.html#introduction-to-asp-net-core)
If you want to try the latest ASP.NET Core tooling builds for Visual Studio 2015, you can download from here. You can view [release notes] (https://github.com/aspnet/Tooling/blob/master/release-notes.md) to read about additional details. You can also visit [issue tracker] (https://github.com/aspnet/Tooling/issues) to view existing issues and open new ones.