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Re:Writing a Simple Linux Kernel Module by pjmlp on Friday December 01, 2017 @11:50AM (#15825075)
BeOS, Symbian, macOS, Windows, AS/400, GenodeOS, mbedOS

Just a couple of examples.

Re:Writing a Simple Linux Kernel Module by waddlesplash on Friday December 01, 2017 @01:30PM (#15826004)
BeOS' kernel itself didn't use C++ if I recall correctly, though some drivers did. Haiku, BeOS' open-source successor, has a kernel written almost entirely in C++.