Yeah, Walter did end up opening up the backend to DMD but the backend is still not Free Software only because Walter is licensing it from Symantec. He accepts p

Yeah, Walter did end up opening up the backend to DMD but the backend is still not Free Software only because Walter is licensing it from Symantec. He accepts patches to fix problems in it but it is less than ideal. The frontend is GPL and has had the copyright assigned to the FSF. The good news is that GDC (gcc backend) and LDC (LLVM backend) both produce faster binaries than DMD and are completely open source. The only downside is they tend to be a version or two behind DMD (which at DMD's release rate is around 3-6 months or so I'd say). Also, LDC isn't available for Windows primarily because LLVM doesn't yet support SEH exceptions. In any case, the compiler's licensing doesn't affect software you write in D.