CodeLobster PHP Edition is a free portable handy and easy-in-use code editor that is primarily intended for quick and easy creation and editing of PHP, HTML, CSS, JavaScript files with support Drupal CMS, Joomla CMS, Smarty template engine, JQuery library, CodeIgniter framework, CakePHP framework, Facebook social network and WordPress blogging platform.

This is free, open-source Integrated Development Environment for programme developers. Programmers gets all the tools they need to create professional desktop, enterprise, web, and mobile applications with the Java platform, as well as C/C++, PHP, JavaScript, Groovy, and Ruby.

NetBeans IDE introduces the JavaFX Composer, support for JavaFX SDK 1.3, OSGi interoperability, support for the PHP Zend framework and Ruby on Rails 3.0, and more.It is easy to install and use straight out of the box.

PHP Coder is an Integrated Development Environment specially made for PHP developers.
Through tight integration of the PHP interpreter and the PHP documentation, PHP Coder gives you a time-saving Development Interface. Features are Complete Integration of the PHP Interpreter and the PHP documentation, Integrated Preview window, Full Syntax Highlighting for HTML and PHP, Auto-Complete for frequently used text constructions, Project manager, Tag Buttons and all the main editing functions like almost unlimited undo, copy and paste, searching, ...

Dev-PHP is a lightweight development environment for PHP. Dev-PHP is hardly comparable with the likes of Zend Studio or Nusphere but is more than a syntax editor.

It provides syntax highlighting for CSS, JavaScript, HTML, XML and even SQL. Currently in alpha release, Dev-PHP also supports development of PHP-GTK applications, an internal web browser, class browser and convenient access to your PHP documentation.

You can use it to create scripts and programs using the PHP scripting language and the PHP-GTK library.

Geany is a small and lightweight Integrated Development Environment (IDE). It was developed to ensure a small and fast IDE, which has only a few dependencies from other packages. Another objective was to be as independent as possible from a special Desktop Environment like KDE or GNOME - Geany only requires the GTK2 runtime libraries.

Some basic features of Geany:

# Syntax highlighting
# Code folding
# Symbol name auto-completion
# Construct completion/snippets
# Auto-closing of XML and HTML tags
# Call tips

There are so many IDE's that based on Eclipse platform, and countless projects have been crafted in Eclipse IDEs. For PHP development this is Eclipse PDT (PHP Development Tools) project.

Eclipse PDT was developed jointly by IBM and Zend, although participators come from beyond those two organisations. Not long ago, Aptana (whose Aptana Studio supports PHP) has begun significant contributions to the PDT project.

Eclipse PDT is available for Windows, Linux, and Mac OS X. Windows and Mac OS X versions can be had in 32-bit or 64-bit variants.

ConTEXT is smart, fast and very powerful text editor for developers. Unlimited open files, unlimited editing file size length, 4kB line length, powerful syntax highlighting for C/C++, Delphi/Pascal, 80x86 assembler, Java, Java Script, Visual Basic, Perl/CGI, HTML, SQL, Python, PHP, Tcl/Tk, user defineable syntax highlighter, project workspaces, compiler integration, multilanguage support and many more features.

Some features:

Komodo IDE 5 is an multi-platform, multi-language professional development environment for dynamic programming languages and open source technologies. It’s a good choice for all software developers looking for reliable tools that deliver a strong return on investment.

Notepad++ is a free editor of source code and Notepad replacement that supports several languages. Running under the Windows environment, its use is controlled by GPL License.

Based on the powerful editing component Scintilla, Notepad++ is written in C++ language and uses Win32 API and STL which provides a higher execution speed and smaller program size. By optimizing as possible without losing user friendliness, Notepad++ tries to reduce the load on your PC. When using less CPU power, the PC can throttle down and reduce power consumption, resulting in a greener environment.