That would be mix of D, Object Pascal, Swift, Ada, C#, Java.<p>A few decades ago plenty of Oberon dialects.<p>As language geek, I randomly select languages when doing hobby coding.<p>Regarding Go's remark, even if I dislike Go's authors decisions, back in my day writing compilers, linkers, firmware, networking stacks, and OS services was considered systems programming.<p>Likewise .NET team has been making wonders catching up to what C# 1.0 should have been for low level code, given its Delphi linage.<p>Java, in the context of being whole Android userspace, including drivers, there is very little systems exposed in the NDK. Vulkan is one of the few things not exposed to Java land, and that is being fixed with WebGPU like API in an upcoming version.