Digital Mars compiler package
I might have overlooked something, but it appears that Digital Mars is a Windows compiler (that is incidentally able to produce DOS executables).
To make this issue complete: In 2006 I asked Walter Bright in Need DOS compiler about a pure DOS version of his compiler. His answer was: "It's far too big to fit in 16 bits anymore."
Yes, he knows, what a DOS extender is, but anyway.
The Digital Mars compiler appears to be open-source nowadays. Might be cool to have it available as a devel package.