Most interesting in IDE

Free
Programs & provides debugging support for apps developed in C, C++ and Fortran
Free
Development environment for PHP
Free
Develops applications based on the R language
Free
Creates interactive content from the user's media files
Offers basic functionality such as reading and erasing diagnostic trouble codes

Top rated in IDE

Geany
Free

Small and lightweight Integrated Development Environment

ZAPP
Free

Lightning-fast scriptable application development for Windows

Quincy 2005
Free

It is a simple programming environment for C/C++ on Windows

jGRASP
Free

Automates application project development

IBM Rational Rose Enterprise
Free

It is one of the most comprehensive products in the Rational Rose family

GX Developer
Free

Developed by GX Developer

Microsoft XNA Game Studio
Free

XNA Game Studio 3.0 allows create games for Windows ans Zune players

VTFEdit
Free

Create VTF and VMT files

Resource Tuner
Free

It lets you view, extract, replace, edit, and delete resources of executables

Expresso
Free

Expresso 3.0 is a free .NET regular expression development tool

Programmer's Notepad
Free

Programmer's Notepad is a text editor especially designed for programmers

Komodo Edit
Free

Write codes in Perl, PHP, Python, Ruby, Tcl, JavaScript, CSS, HTML

Qt
Free

Create interfaces for different types of platforms

PonyProg2000
Free

I've been using PonyProg2000 for a few years now and it's been a great tool for programming microcontrollers

Flash Magic
Free

Programs and runs flash-based microcontrollers

Microsoft Visual Studio Professional
Free

Creates applications, sites, and services for Windows

Microsoft Visual C++ 2008
Free

Great tool for programming in Windows environments. It has a wide range of features and tools to help developers create robust and reliable applications

Aptana Studio
Free

It allows you to develop and test your entire web application

Mono for Windows
Free

Implementation of Microsoft's .NET Framework based on the ECMA standards for C#

Lazarus
Free

Create graphical user interfaces for Windows applications