Comment by mtlynch
Former Googler. I also miss Critique/Gerrit. I've tried a bunch of alternatives, and I like CodeApprove:
It's great if you have a team that does code reviews. It works less well for reviewing contributions from external contributors on an open-source project,a as the contributor likely just wants to get their PR merged and doesn't want to learn a special reviewing tool.
No affiliation, just a happy customer.
"lookup table of similar technology and services to help ex-googlers survive the real world"
https://github.com/jhuangtw/xg2xg