Open source releases from Microsoft
Blazor is an experimental .NET web framework using C#/Razor and HTML that runs in the browser with WebAssembly
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
Entity Framework Core is a lightweight and extensible version of the popular Entity Framework data access technology
Tools for ASP.NET Core apps, such as MSBuild targets, Visual Studio extensions, and command line tools. (Open issues on https://github.com/aspnet/AspNetCore/issues)
.NET APIs for commonly used programming patterns and utilities, such as dependency injection, logging, and configuration.