Coffee Cup
Or should we call it three editors in one now that we have added CSS code completion and property lists? You can decide that for yourself. We just know that designing and coding HTML and CSS is now faster and easier than ever! Find out what else is new in the CoffeeCup HTML Editor.
http://www.coffeecup.com/html-editor/

Kompozer
KompoZer is a complete web authoring system that combines web file management and easy-to-use WYSIWYG web page editing. KompoZer is designed to be extremely easy to use, making it ideal for non-technical computer users who want to create an attractive, professional-looking web site without needing to know HTML or web coding.
http://www.kompozer.net/

Pspad
Editor PSPad - freeware HTML editor, PHP editor, XHTML, JavaScript, ASP, Perl, C , HEX editor
http://www.pspad.com/en/screenshot.htm

HTML Edit
Real-time HTML Editor.
http://htmledit.squarefree.com/

Chami - HTML Kit
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.com user reviews with millions of downloads.
http://www.chami.com/html-kit/

Arachnoid
Arachnophilia is a Web page development workshop and general programming tool.
http://www.arachnoid.com/arachnophilia/

Notepad Plus
Notepad++ is a free (as in "free speech" and also as in "free beer") source code editor and Notepad replacement that supports several languages. Running in the MS Windows environment, its use is governed by GPL Licence.
http://notepad-plus.sourceforge.net/uk/site.htm

Hapedit Free
HAPedit is an acronym for Html Asp Php editor; a win32 text-mode editor useful for all developers of dynamic web pages. Its main features are: syntax highlighting for html/php, html/asp, html, JavaScript, CSS and SQL; page preview in browser; project manager; php code "compilation"; edit html tags; code completion; preview images; SQL console; FTP Manager; Code Explorer and more.
http://hapedit.free.fr/

Blue Fish
Bluefish is a powerful editor targeted towards programmers and webdesigners, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages, and it focuses on editing dynamic and interactive websites. See features for an extensive overview, take a look at the screenshots, or download it right away. Bluefish is an open source development project, released under the GNU GPL licence.
http://bluefish.openoffice.nl/index.html

Quanta
Quanta Plus is a highly stable and feature rich web development environment. The vision with Quanta has always been to start with the best architectural foundations, design for efficient and natural use and enable maximal user extensibility. We recognize that we don't have the resources to do everything we would like to so our target is to make it easy for you to help make this the best community based desktop application anywhere. Pretty much everything in Quanta is designed so you can extend it. Even the way it handles XML DTDs is based on XML files you can edit. You can even import DTDs, write scripts to manage editor contents, visually create dialogs for your scripts and assign script actions to nearly any file operation in a project. You can even look at and communicate with a wide range of what happens inside Quanta using DCOP.
http://quanta.kdewebdev.org/

Free HTML Validator
Clean up your site with CSE Lite! CSE HTML Validator Lite is an award winning FREE (for personal and educational use) HTML editor and basic HTML syntax checker for Microsoft Windows 2000, XP, Vista and above. It's also adware and spyware free!
http://www.freehtmlvalidator.com/

Alley Code
Alleycode is a fast, sleek and highly productive award winning HTML editor with unique features. If you are new to HTML, Alleycode's great tutorial will walk you through your first coding steps... If you are an established coder you will find a refreshing, non-bloated infrastructure with fast and accurate delivery. Beyond HTML, Alleycode's wizardry focuses on PHP and CSS interaction for professional and easy management of your projects. Best of all, Alleycode is FREE! (we do accept donations if you find it useful).
http://www.alleycode.com/screenshots.htm

Trellian
Trellian WebPage is a freeware application and will remain FREE.
http://www.trellian.com/webpage/

Amaya
Amaya is a Web editor, i.e. a tool used to create and update documents directly on the Web. Browsing features are seamlessly integrated with the editing and remote access features in a uniform environment. This follows the original vision of the Web as a space for collaboration and not just a one-way publishing medium.
http://www.w3.org/Amaya/Overview.html