Well, here's an unexpected combination... Toyota's Toyota Connected North America unit is developing a console-grade open-source game engine. Making it even more unusual is their engineering choices of building around the Flutter toolkit and in turn the Dart programming language. This new game engine creation is called Fluorite.
Toyota Connected North America is Toyota Motor Corporation's subsidiary founded in collaboration with Microsoft for working on in-vehicle software, AI, and related tech initiatives. Toyota Connected developers announced at FOSDEM