HTML Editors

These editors support easier editing of HTML documents. While you can write HTML documents in any text editor, these provide specific support for their easier generation.

HTML-Kit
For the most part, HTML-Kit is a HTML code editor, although, it has support for many file types (HTML, XHTML, XML, CSS, XSL, JavaScript, VBScript, ASP, PHP, JSP, Perl, Python, Ruby, Java, VB, C/C++, .NET C#, Delphi / Pascal, Lisp, SQL, and more). In recent years it has produced other tools and services that don't necessarily fit inside a code editor. So, I guess it's reasonable to say that HTML-Kit has in a way become a collection of tools for developers.
[OS: Windows] [Price: Free]
PSPad
PSPad is a fantastic free text editor with all the features you would expect from a powerful editor. PSPad comes with built-in support for multiple syntax highlighting profiles. It comes with a hex editor, code page conversion, built in diff, templates, macros, spellcheck option, auto-completion, Code Explorer and much more. PSPad includes several additional tools that are especially useful for HTML editing (compress, format code) and also integrates TopStyle Lite and TidyHTML. The program can be used as an IDE for any compiler. Additional features include support for projects, file browsing, custom shortcuts, built in FTP client to edit files on the server and much much more. Unlike most other editors, the menus are very well thought out and all functions are located in the most logical location.
[OS: Windows] [Price: Free]
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. Amaya started as an HTML + CSS style sheets editor. Since that time it was extended to support XML and an increasing number of XML applications such as the XHTML family, MathML, and SVG. It allows all those vocabularies to be edited simultaneously in compound documents.
[OS: Cross Platform] [Price: Free]
HAPEdit
HAPedit is an acronym for Html Asp Php editor; a win32 text-mode editor useful for all developpers of dynamic web pages. It's 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.
[OS: Windows] [Price: Free]
Web Notepad
Web Notepad is a web editor for real HTML coders. It supports an easy to use interface, syntax highlighting, FTP uploading with folder mapping, multi-file tab pages, word wrap, and a very rich editing environment.
[OS: Windows] [Price: $15]
NoteTab
NoteTab is the ultimate free Notepad replacement and a capable HTML editor. Move quickly around a stack of large files with a simple tabbed interface. Format your text to your heart's content. Write with the font of your choice, fixed-width or proportional. If you need to cut and paste chunks from a pile of files, forget the Clipboard: you can set up a Paste Board file to save text clips automatically. Strip HTML tags from your files. Call up complete document statistics instantly. Use powerful, system-wide search and replace tools.
[OS: Windows] [Price: Lite is Free, Standard $9.95, Pro $19.95]
Crimson
Crimson Editor is a professional source editor for Windows. While it can serve as a good replacement for Notepad, it also offers many powerful features for programming languages such as HTML, C/C++, Perl and Java. It offers Syntax Highlighting for HTML, C/C++, Perl, Java, Matlab and LaTeX and can be extended for other programming languages based on custom syntax files. Additional features include multi-level undo/redo, user tools, macros, spell checker, bookmarks, print support, FTP support and much more.
[OS: Windows] [Price: Free]