Ditto Digital Mars C++ (nee Symantec C++, nee Zortech C++). But as I recall, like most other "alternative" C++ compilers, it's also stuck in the C++03 land.
DMC++ is still awesome, because it's the only ISO C++ compiler out there that can target any kind of DOS platform and binary format, from 16-bit .COM files (!!!) to 32-bit DOS extender.
