The closest I had seen was the OSU PDK (https://vlsiarch.ecen.okstate.edu/flow/), but it certainly wasn't Apache Licensed as this is. The license is interesting because there had been some debate as to whether ASL is appropriate for hardware -- see some discussions at FOSDEM from 2019 for example, if my memory serves me right. Seeing that this is being published by Google would (generally) imply that internal legal did their homework and came down with the assessment that: yes indeed ASL is appropriate for hardware. Intriguing.