Today, we’re releasing .NET 5.0 Preview 6. It contains a small set of new features and performance improvements. The .NET 5.0 Preview 4 post covers what we are planning to deliver with .NET 5.0. Most of the features are now in the product, but some are not yet in their final state. We expect that the release will be feature-complete with Preview 8. 

All of these tools are shipped as part of Visual Studio but are not installed in the same way as you would install them manually. They are all located in the Visual Studio install directory and are used by some of the new features such as the Task Runner Explorer and the new ASP.NET 5 project system. 

If you are working with .NET, then there are some very easy to consume libraries to help you host a WebSocket server or connect as a WebSocket client. 

Microsoft Learn For .NET
Free. Cross-platform. Open source.
Learn how to build apps across multiple platforms with programming languages like C#, F#, and Visual Basic. Supported on Windows, Linux, and macOS, get started developing your next project with .NET today. 

this is just a list of ones that have officially supported C# libraries, or are written in .NET.  

Today, we are shipping .NET 5.0 Release Candidate 1 (RC1). It is a near-final release of .NET 5.0, and the first of two RCs before the official release in November. RC1 is a “go live” release; you are supported using it in production. 

Since we shipped .NET Standard 2.0 about a year ago, we’ve shipped two updates to .NET Core 2.1 and are about to release .NET Core 2.2. It’s time to update the standard to include some of the new concepts as well as a number of small improvements

Lots of people are using open source .NET Core and the "dotnet" command line, but few know that the .NET CLI supports command "tab" completion!

You can ensure you have it on .NET Core 2.0 with this test: 

dotnet complete "dotnet add pac"