Schleswig-Holstein, one of Germany’s 16 states, on Wednesday confirmed plans to move tens of thousands of systems from Microsoft Windows to Linux. The announcement follows previously established plans to migrate the state government off Microsoft Office in favor of open source LibreOffice.
You have FreeIPA if you want a ”product”.
But honestly, if I, as a Linux admin, would do this kind of thing at this scale, I’d probably elect to remain on AD.