OpenCOBOL is an open-source COBOL compiler. OpenCOBOL implements a substantial 
part of the COBOL 85 and COBOL 2002 standards, as well as many extensions of 
the existent COBOL compilers.

OpenCOBOL translates COBOL into C and compiles the translated code using the 
native C compiler. You can build your COBOL programs on various platforms, 
including Unix/Linux, Mac OS X, and Microsoft Windows.