KompoZer is described as 'Complete web authoring system that combines web file management and easy-to-use WYSIWYG web page editing' and is a very popular Code Editor in the development category. There are more than 50 alternatives to KompoZer for a variety of platforms, including Windows, Mac, Web-based, Linux and SaaS apps. The best KompoZer alternative is Adobe Dreamweaver. It's not free, so if you're looking for a free alternative, you could try Silex or WebStorm. Other great apps like KompoZer are Pinegrow Web Editor, Nova, WYSIWYG Web Builder and RocketCake.
Create visually appealing websites effortlessly using customizable templates and a drag-and-drop editor. Features include real-time previews, responsive design, built-in photo editor, and a library of royalty-free images. Add interactivity with animations and SEO-friendly features, all without coding skills.
Nvu (pronounced N-view, for a "new view") is a complete Web Authoring System that combines web file management and easy-to-use WYSIWYG (What You See Is What You Get) web page editing. Nvu is designed to be extremely easy to use, making it ideal for non-technical...
Development has stopped at June 2005 with version 1.0. 
KompoZer and 
BlueGriffon are forks.
HTML Kit is a full-featured free editor for HTML, XHTML, XML, CSS, JavaScript, PHP and other text files. 400+ plugins are available for it, including HTML Tidy for creating standards-compliant web pages. HTML-Kit has received 95% thumbs up on Download.
Pala is a component-based CMS that streamlines development and content management by putting code and content in the same place. Developers get full code control with a browser-based IDE, editors get focused visual content editing, and visitors get sub-second loading speeds.
The CoffeeCup Free HTML Editor is a drag-and-drop HTML Editor with built-in FTP uploading. It has wizards for tables, frames, forms, and fonts, and comes with all HTML 4.0 and XHTML tags.
CodeLobster - Free portable PHP IDE with support Drupal, Smarty, WordPress, Joomla, JQuery, CodeIgniter, HTML, CSS, JavaScript, CakePHP, Facebook, Symfony
Tumult Whisk is the lightweight HTML and PHP editor with a live preview pane that displays the updated page as you type. It is an essential app for your web dev toolkit.
Powerful PHP IDE and PHP editor with built-in HTML, CSS and JavaScript editor. Fast. Powerful. Time-saving!
WebEasy website creation software includes everything you need to create your ideal website with built-in templates and e-commerce tools. Drag-and-drop simplicity and automatically HTML code generation, create the website you want without any programming or technical skills...
Foopad is nondestructive source code editor / integrated development environment made to make your dev life better. Foopad has some unique features and can be customized to be like simple notepad or full IDE.
Create and publish your own web pages and digital photo galleries in minutes, without any HTML knowledge. Antenna's powerful editor is entirely visual, giving you pixel accurate control. Wherever you drag & drop text, pictures, buttons, flash animation and movies on...
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It's the predecessor of KompoZer