Notepad++ is a free source code editor and Notepad replacement that supports several languages.
Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features.
Enjoy productive PHP and web development with PhpStorm. Take advantage of deep code understanding, top-notch coding assistance, and support for all major tools and frameworks.
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.
Notepad3 is a fast and light-weight Scintilla-based text editor with syntax highlighting. It has a small memory footprint, but is powerful enough to handle most programming jobs.
Aptana Studio is a complete web development environment that combines powerful authoring tools with a collection of online hosting and collaboration services that help you and your team do more. Includes support for PHP, CSS, FTP, and more...
ATPad is a simple Notepad replacement written in pure C and Windows API. Keeping simplicity of Notepad it provides many additional features. 90kb UPX repacked.
Howl is a general purpose editor that aims to be both lightweight and fully customizable. It is built on top of the very fast LuaJIT runtime, and can be extended in either Lua or Moonscript. It has a minimalistic UI driven mainly by the keyboard.
The last version (0.6) is from April 2019.