300 MHz 180 nm Libre-SOC using fully free and open source toolchain
evanh
Posts: 16,027
https://openpowerfoundation.org/libre-soc-180nm-power-isa-asic-submitted-to-imec-for-fabrication/
In particular Coriolis2, automated HDL to GDS-II - https://gitlab.lip6.fr/vlsi-eda/coriolis
Docs - http://coriolis.lip6.fr/pages/documentation.html
Might be able to eventually bring layout back in-house