Open-Source Hardware: curated list of open-source ASIC tools and designs
github.comPrecursor is not on the list, https://www.crowdsupply.com/sutajio-kosagi/precursor
AIUI this is more about EDA, which you'd use to design a product. Not about the finalized product itself.
A curated list of awesome open source chip-design tools, generators, and reusable designs.