https://wafer.space allows chips but I think tinytapeout became what efabless was doing: https://chipfoundry.io/

Also Hitachi's SH-2 & SH-4 patents expired in 2016, so J-core picked up where they left off: https://j-core.org/

MIPS also went open source around 2018: https://www.datacenterknowledge.com/data-center-hardware/mip...