I'm having some serious personal debates about the value of design systems the way we are currently doing them. Seeing this list made me realize even further that so many of these product component design systems all look the same. It feels like we are back in the days of skinning bootstrap components.
That is not to say that is necessarily bad, but I'm beginning to question the amount of resources companies put into building out these systems that are often ignored or worked around in the long run.
Have also been compiling a few in this repo: https://github.com/alexpate/awesome-design-systems/
That's resourceful, mate.