Which Integrated Development Environments (IDE) is commonly used by programmer?

There are lots of free tool which are used for producing software code like Visual Studio Express, Eclipse, Netbeans, kate etc. These development environments are free of charge. Beside this, there are other tools which are used by various programmers. Each & every tools have pros as well as some cons.
My main concern is to find out, which integrated development environment (IDE) is commonly used by various minded programmers like you? Please share your thoughts of mind