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Netbeans - NetBeans IDE 7.0. Develop desktop, mobile and web applications with Java, PHP, C/C++ and more. Runs on Windows, Linux, Mac OS X and Solaris. NetBeans IDE is open-source and free.
mikroC - mikroC is a full-featured ANSI C compiler for 5 different microcontroller architectures. It is the best solution for developing code for your favorite microcontroller
Qt Creator - Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.
Embitz - Embitz is a free C/C++ IDE built to meet the most demanding needs of its users working in the field...
C4droid - C4droid is an intelligent IDE and C/C++ compiler, allowing you to create your own application on Android devices.
PicCBuilder - an Eclipse plugin for allowing the use of Eclipse CDT