jGRASP!

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. »

IntelliJ IDEA is a free / commercial Java IDE by JetBrains. Its design is centered on programmer productivity. A number of its features are intended to accelerate development and allow programmers to concentrate on functionality while IntelliJ IDEA handles routine coding tasks.

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

Embitz is a free C/C++ IDE built to meet the most demanding needs of its users working in the field of embedded software development It is designed to be very extensible and fully configurable.

Integrated Java development environments set high requirements on the computer equipment.

A free Java IDE with integreted tools: class hierarchy, add listener automatically, project relationship, view zipped file, add class code, runtime input stream, view class and Java file in class paths, format Java file.