Here are some free WYSIWYG HTML Editor software and online tools. You can edit the output content and HTML source code and preview it.

Visual Studio Code is a free, lightweight but powerful source code editor that runs on your desktop and on the web and is available for Windows, macOS, Linux, and Raspberry Pi OS.

In Visual Studio 2013 the default editor for static HTML pages loses a lot of useful functionality compared to the default version used in Visual Studio 2012 and earlier. In Figure 1, notice that ...

The January release of Visual Studio Code 1.9 is out with a bunch of fixes, updates and new features, including a new interactive playground that lets developers try out editing features immediately.

The latest preview of Visual Studio 2019 16.7 adds an experimental Razor editor for working with Blazor, boosting web development with C#/.NET instead of JavaScript.