Zend Studio!

Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft. It is used to develop computer programs for Microsoft Windows, as well as web sites, web applications and web services. Visual Studio uses Microsoft software development platforms such as Windows API, Windows Forms, Windows Presentation Foundation, Windows Store and Microsoft Silverlight. It can produce both native code and managed code.

A free, open-source Integrated Development Environment for software developers. You get all the tools you need to create professional desktop, enterprise, web, and mobile applications with the Java language, C/C++, and even dynamic languages such as PHP, JavaScript, Groovy, and Ruby. NetBeans IDE is easy to install and use straight out of the box and runs on many platforms including Windows, Linux, Mac OS X and Solaris.The download section conveniently offers prepackaged bundles/installers for each supported programming language containing only required plugins. »

Smart PHP Code Editor

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...

Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment which is part of the SDK for the Qt Framework.

Xcode is Apple's premiere development environment for Mac OS X. In addition to being packaged on the DVD with every copy of Mac OS X, the latest Xcode developer release is always available for free to ADC members and includes all the tools you need to create, debug, and optimize your applications. At the heart of the Xcode tools package is the Xcode IDE, a graphical workbench that tightly integrates a professional text editor, a robust build system, a debugger, and the powerful GCC compiler capable of targeting Intel and PowerPC regardless of host platform. Xcode is both easy to use, and yet powerful enough to build the largest Mac OS X applications. The complete Mac OS X developer tools chain is distributed as part of Xcode; these tools include Interface Builder, Instruments, Dashcode, the WebObjects framework, and the complete reference documentation, to name just a few. »

slap is a Sublime-like terminal-based text editor that strives to make editing from the terminal easier. It has:

The Projucer is a comprehensive project management and code editing tool with a revolutionary C++ live coding environment which has full C++11 support. It is built with and easily used for JUCE development.

CSSEdit is a visual cascading style sheet editor built-in Espresso , with CSS3 support for multi-browser gradients, shadows and more.

The C++ IDE for professional developers.

Nvu (pronounced N-view, for a "new view") is a complete Web Authoring System that combines web file management and easy-to-use WYSIWYG (What You See Is What You Get) web page editing. Nvu is designed to be extremely easy to use, making it ideal for non-technical computer users who want to create an attractive, professional-looking web site without needing to know HTML or web coding.

Pelles C is a comprehensive development suite that can help you create apps compatible with Windows and ARM platforms.

ZinjaI is an IDE (integrated development environment) for C + + developed in the context of a Starter Grant from the Scientific Research at the Universidad Nacional del Litoral, Argentina, designed for use by students of programming.

WeBuilder is a faster, smarter and more powerful all-in-one code editor for web developers. Clean interface, quick startup, superb flexibility and powerful features allow you to create and manage code written in HTML, CSS, JavaScript, PHP, Ruby, Python, ASP, SSI, Perl and other languages faster and easier, while integrated tools enable you to validate, reuse, navigate and deploy your code in an efficient and sophisticated manner.