Vitess maybe? from what I have demoed and for being open source that’s the one I would choose. Unfortunately there isn’t a Postgres compatible one that is as mature yet and certainly not free.

Got it, thank you! CockroachDB is the only one I know offhand that does what you're looking for. Another comment mentioned Vitess, which might also work.

It seems like there are a lot of options for large scale analytics, but I don't know a lot for high throughout geo-redundant transaction processing.