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NetBeans is a free, GPL-licensed IDE. It can run on any computer with a Java virtual machine. If a computer has a Java virtual machine (JVM), Netbeans can run on it. Netbeans can, therefore, run on a variety of operating systems such as Windows, *nix, and Mac OS.
Pro Good refactoring
Pro Easy to learn
Very easy to learn, unlike e.g. Eclipse (which is probably the most flexible).
Pro Multiple revision control system integration
Pro Customizable theme
Pro Good support for integrated Database e Servers (E.g. Tomcat)
Pro Take less memory
The Netbeans IDE is known to take a large memory as compared to other lighter IDE's available on the market. The slowdown can decrease productivity and frustrate programmers.
Con Little support for UML
Unless you load extensions.