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MoltenVK
MoltenVK is a Vulkan Portability implementation. It layers a subset of the high-performance, industry-standard Vulkan graphics and compute API over Apple's Metal graphics framework, enabling Vulkan applications to run on macOS, iOS and tvOS.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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metal-cpp
Metal-cpp is a low-overhead C++ interface for Metal that helps developers add Metal functionality to graphics apps, games, and game engines that are written in C++.
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bgfx
Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.
The thing you're asking for doesn't exist. Metal is the only API allowed to officially exist on Apple platforms at this point, and this is unlikely to change. MoltenVK implements a subset of Vulkan over Metal, so you can technically use Vulkan on all three major desktop platforms, but it is far from perfect.
Take a look at BGFX, sounds like its what you want. Its a cross platform graphics API that is low level like metal or opengl, however it treats opengl, metal, vulkan, etc as backends that u can compile to so you can write your code once and then compile to macos using metal as the backend, compile to web using webgl as the backend, compile for windows using directx as the backend etc etc. Its written in C++ but it has officially supported C bindings so you can use it with C no problem.