Notepad++ is a fast, time-tested, foolproof HTML editor with a straightforward, clean UI, and while this HTML editor is exclusively for Windows; Linux users can use it via Wine.
Komodo Edit allows debugging, unit testing, and code refactoring, and adds extensions if you need to support other languages or useful features including special characters.
Brackets offers visual tools and preprocessor support, making designing in the browser a breeze. Styling and customization is simple, so coders will never get bored.
Sublime Text 3 is one of the best HTML IDEs thats highly customizable, fast, flexible, and supports TypeScript, JSX, and TSX programming languages.