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

Espresso is a gorgeous Mac-only code editor that’s powerful and smooth, like the caffeinated beverage it’s named after. This ...

In addition to executing code embedded in HTML, it's also possible to add a code editor directly into an HTML page using the py-repl tag so that you can input code and execute it, as shown below.

“The editors in most IDEs don’t have nearly enough features and they make manipulating code difficult,” says Chris Rathman, a consultant and software developer.

Zed, a startup developing a code editor optimized for collaboration, has raised $10 million in a fresh venture capital round.