FerretDB #

FerretDB is a proxy over Postgres (and potentially other databases) that provides a MongoDB compatible interface to applications. It allows users of MongoDB to migrate to Postgres without any changes to their application code.

It has been designed to help people escape Mongo's licensing change and I'm not sure whether it would be useful outside that context. It does seem very helpful in adapting opensource projects that were built on MongoDB, avoiding a difficult rewrite by putting the complexity into the proxy.