Forgotten because I never think about it being there. Yet it is one of the more interesting implementations: free as in free beer, even for commercial purposes. Support costs money (which is fine). Good portability - unfortunately not available on OS/X - when you consider Windows and various Unix systems. And a compiler that generates natively executable programs directly - especially practical for classical application development. Due to the nature of compilation (via a C compiler), integration of external C libraries is also good. So if you can live with the platform limitation, it is certainly a very interesting implementation.