When I discovered D (pre 1.0) the compiler front end was open source, but the back end source was closed. I was surprised years later when I found it now more o

When I discovered D (pre 1.0) the compiler front end was open source, but the back end source was closed. I was surprised years later when I found it now more open. There was a compiler called DLI that even used the front end code and wrote a new backend that used nasm. I remember porting that to BeOS because none of the other opensource back ends were easily portable at the time.