Code::Blocks

Code::Blocks is a free C++ IDE built to meet the most demanding needs of its users. It is designed to be very extensible and fully configurable.

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Anjuta
Anjuta is a versatile Integrated Development Environment (IDE) for C and C++ on GNU/Linux.

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Eclipse
Java based environment combining a number of different Eclipse projects

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KDevelop

IDE (Integrated Development Environment) for KDE. Since then, the KDevelop IDE is publicly available under the GPL and supports many programming languages.

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NetBeans IDE
open-source Integrated Development Environment for Java language, C/C++, and even dynamic languages such as PHP, JavaScript, Groovy, and Ruby.

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Sun Studio
Sun Studio software provides compilers and tools for C, C++, and Fortran development
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CodeLite

powerful open-source, cross platform IDE for the C/C++ programming languages

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