As one of the commenters points out, Intel continues to develop a proprietary compiler. I think that's a better example than Apple for this case.
In general, the world is more than just C/C++. IBM dominates the enterprise COBOL market. (See http://www.itworldcanada.com/article/most-wanted-the-elusive... .) And there are several commercial Fortran compilers besides Intel, including that of NAG (Numerical Algorithms Group) and PGI (The Portland Group).
In general, the world is more than just C/C++. IBM dominates the enterprise COBOL market. (See http://www.itworldcanada.com/article/most-wanted-the-elusive... .) And there are several commercial Fortran compilers besides Intel, including that of NAG (Numerical Algorithms Group) and PGI (The Portland Group).