I don&#x27;t think any of the current open-source forks are ready for production.<p>The oldest one is Postgres-X2 [1] (formerly Postgres-XC), a project sponsored by NTT. It implements fully consistent multimaster replication and partitioning. After many, many years apparently still isn&#x27;t production-ready, and it seems to have a significant scalability bottleneck that&#x27;s tied to its design. Another issue is that being a fork, it has to be continually updated from the mainline. It&#x27;s currently based on 9.3.<p>Postgres-XL [2] is apparently a merger of Postgres-XC and a different implementation called StormDB that was bought by a small company called TransLattice. (TransLattice also sponsored or acquired an earlier project that went nowhere, Postgres-R.) Unlike XC&#x2F;X2, they say they aim to contribute changes back to the mainline, and they also claim their distributed query model is superior.<p>With the commerical support behind it (it&#x27;s used as the basis of a commercial product), it&#x27;s possible that this is something that will be usable. Unfortunately, it seems very quiet and not very open-sourcy; most of the development seems to be by just one guy [3], and nobody seems to be using it in production at this point.<p>[1] <a href="https:&#x2F;&#x2F;github.com&#x2F;postgres-x2&#x2F;postgres-x2" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;postgres-x2&#x2F;postgres-x2</a><p>[2] <a href="http:&#x2F;&#x2F;www.postgres-xl.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.postgres-xl.org&#x2F;</a><p>[3] <a href="http:&#x2F;&#x2F;git.postgresql.org&#x2F;gitweb&#x2F;?p=postgres-xl.git;a=summary" rel="nofollow">http:&#x2F;&#x2F;git.postgresql.org&#x2F;gitweb&#x2F;?p=postgres-xl.git;a=summar...</a>