GCC

(gcc & g++)

http://gcc.gnu.org/

GCC is the GNU Compiler Collection, which currently contains front ends for C, C++

GCC development is a part of the GNU Project, aiming to improve the compiler used in the GNU system including the GNU/Linux variant.

The GCC development effort uses an open development environment and supports many other platforms in order to foster a world-class optimizing compiler, to attract a larger team of developers, to ensure that GCC and the GNU system work on multiple architectures and diverse environments, and to more thoroughly test and extend the features of GCC.