There are 2 repositories under metal-shader topic.
LYGIA, it's a granular and multi-language (GLSL, HLSL, WGSL, MSL and CUDA) shader library designed for performance and flexibility
Shape Animation Examples using SDF with MSL (Metal Shader Language)
Add variable blur to images in UIKit, AppKit and SwiftUI.
opengles 2.0 light engine + tutorials for iOS.
C++ cross-platform gpu SDK
Articles I like
Solar System demonstration using Apple MetalKit
Offline shader compiler with SPIR-V reflection support.