Comment by toast0

They did make Symbian open source[1], but I don't think it's still available. And I'm not sure if it was complete. I think when the Symbian Foundation disbanded and Nokia took over (again), they may have done some more work in closed repos.

Possibly here https://github.com/SymbianSource

[1] https://www.wired.com/2010/02/symbian-operating-system-now-o...