If you decide you want more functionality than what the community edition offers, keep in mind that the premium edition is closed source (with licenses starting at $199). You can see a comparison of the two editions here.
NetBeans is a free, GPL-licensed IDE. It can 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.