We just open-sourced DOS 4 (and found binaries of Multitasking DOS 4) https://www.hanselman.com/blog/open-sourcing-dos-4
Open Sourcing DOS 4

See the canonical version of this blog post at the Microsoft Open Source Blog! ...

@shanselman Tagging @eniko who was just hoping on an open sourced qbasic

@Tedspence @shanselman lol that post was inspired by this one actually but I didn't wanna bug anyone by sending them an @

(Please open source qbasic though it would mean so much to me)

@eniko @Tedspence we did open source GWBasic and thereโ€™s also this https://github.com/QB64Team/qb64
GitHub - QB64Team/qb64: BASIC for the modern era.

BASIC for the modern era. Contribute to QB64Team/qb64 development by creating an account on GitHub.

GitHub
@shanselman @Tedspence QB64 and FreeBasic are really cool projects but they're not the QBasic that so many people got their start learning to code with under DOS. I understand QBasic isn't that interesting except as a historical artifact, but as an artifact the real deal still holds a lot of value, I think