UltraEdit is a powerful disk-based text editor, programmer's editor, and hex editor that is used to edit HTML, PHP, javascript, Perl, C/C++, and a multitude of other coding/programming languages.
Alternate Textbrowser makes it easy to browse through text, HTML, and XML files with syntax highlighting several programming languages, including C++, Pascal, PHP, Perl, ASM, JScript, and more for free.
RJ TextEd is a web development tool plus a text editor with many features, including syntax highlighting, advanced column mode, and text folding. Portable version also available.
RJ TextEd Portable is a web development tool plus a text editor with many features, including syntax highlighting, advanced column mode, and text folding. Installer also available.
Geany is a free text editor that uses Scintilla and GTK+ and focused on Integrated Development Environments for programmers or web development. A Portable version is also available.
Zettlr plans to redefine what writing means by being slim, fast, and versatile while allowing you to focus on what matters to you. Portable version is also available.
TextPad is a powerful replacement for Notepad, a tool for editing your web pages, or a programming IDE; TextPad does what you want, the way you would expect.