This repository has the flow: https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc/ These repositories have the raw cells themselves, as well as extraction and characterization: https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t18/ https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t15/ https://foss-eda-tools.googlesource.com/skywater-pdk/libs/sky130_osu_sc_t12/