The GNU Compiler Collection includes front ends for C, C++, Objective-C, Fortran, Java, and Ada, as well as libraries for these languages (libstdc++, libgcj,...).
A cross-compiler to allow porting or recompilation of Fortran and Cobol applications from older systems such as mainframes to new ones such as Windows, Linux or web-based applications, or to allow the
... [More] translation of Fortran and Cobol source code into other target languages. The compiler is open-source. [Less]