good question @User - not off hand - but I hope to make one when I get time. Right now, we use CDS liberate for our characterization.

sir is cds liberate opensource

No, it’s a commercial product from Cadence: https://www.cadence.com/en_US/home/tools/custom-ic-analog-rf-design/library-characterization/liberate-characterization.html Continued dependence on such tools is why a purely open source design->silicon remains elusive.