@User: open_pdks is an installer for skywater_pdk. It creates all the setup files for sky130 for all the open-source EDA tools like magic, klayout, xschem, etc., and then it organizes the files from skywater-pdk into a directory structure that is intended to be used by all the open source tools (that is, a structure intended to be common to all PDKs; although there is currently only one such example in sky130, we have other foundry PDKs installed in a similar manner on the efabless platform, and we expect more open-source PDKs in the future). open_pdks addresses a lot of "usability" issues for various tools; e.g., the LEF and GDS files in skywater-pdk are split up one per cell, so open_pdks compiles them all into a single library file.