This 3 software are my Favorite web editor, have a simple layout editor and usage, and the most important thing is this software are FREE.
Go to provided links and you'll see more information on it.
Dev-PHP is a well-featured integrated development environment (IDE). You'll be able to create scripts and applications using the PHP scripting language and the PHP-GTK library (both included in the "PHP Package").
Dev-PHP is free software under the GNU General Public License, which means you can freely modify or use the source code under the terms of the license.
Notepad++ is a free (free as in "free speech", but also as in "free beer") source code editor and Notepad replacement, which supports several programming languages, running under the MS Windows environment.
This project, based on the Scintilla edit component (a very powerful editor component), written in C++ with pure win32 api and STL (that ensures the higher execution speed and smaller size of the program), is under the GPL Licence.