What are some alternatives?
When comparing CoffeeCup HTML Editor and Notepad3, you can also consider the following products
Adobe Dreamweaver - Adobe Dreamweaver is a proprietary web development tool developed by Adobe Systems.
Notepad - Most simple text editor. Just plain text, saves in .txt format.
Pinegrow Web Editor - A professional visual editor for Bootstrap 4 and 3, Foundation, responsive design, HTML, and CSS. Convert HTML to WordPress themes.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
BlueGriffon - An HTML editor based on Mozilla rendering engine.
Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.