PSPad
Cost: Free
Platform: Windows
Languages Supported: Many (see website)
Codetch - Codetch is a code editor that runs along side other Gecko based programs, such as Firefox. Install it as an extension today and have a full featured editor right beside your web pages as you surf!
Cost: Free
Platform: Whatever platform can run Gecko based programs like Firefox, Mozilla, Thunderbird.
Languages Supported: (X)HTML, Javascript, PHP, and others
TSW WebCoder
Cost: $29.99 for 1 personal license
Platform: Windows
Languages Supported: (X)HTML, CSS, JavaScript, VisualBasic Script, PHP, and Perl
HTML-Kit Cost: Free Platform: Windows and Linux Programming languages it supports: All Features: Syntax highlight, extensive plug-in library for programming languages, FTP, HTML Preview + a ton more (not kidding)
Name: Emacs
Cost: Free
Platforms it runs on: AIX 4.3.3, FreeBSD, GNU/Linux , Mac-OS X, MS DOS, MS Windows, NetBSD, OpenBSD, Solaris, SunOS, Ultrix (pasted from url below)
Programming languages it supports: All
URL: http://www.gnu.org/software/emacs/
Name: qstudio
Cost: Free
Platforms it runs on: Windows
Programming languages it supports: PHP, HTML, SQL, Javascript
URL: http://www.qadram.com/products.php
metapad is a small, fast (and completely free) text editor for Windows 9x/NT/XP with similar features to Microsoft Notepad but with many extra (and rather useful) features. It was designed to completely replace Notepad since it includes all of Notepad’s features and much, much more.
The transparency feature is pretty cool but sniff no spell check
Visual SlickEdit Cost: $284.00 Platform: Windows, Linux, OS X, Solaris, AIX, HP-UX, IRIX Programming languages it supports: Primarily C/C++ and Java, supports lots more. Features: Live editing of diffs, advanced code refactoring, class browsing and lots more. Link:http://www.slickedit.com/content/view/73/60/