I have a customer who uses a postgres client but wants access to the data contained in my MariaDB (in real-time, not a one-time copy). The customer only has the ability to use a postgres client, not any other protocol, nor can they install any extra tools. However, I am flexible and can install any needed tools, but I don't want to migrate permanently from MariaDB to PostgreSQL.
Other than MySQL Foreign Data Wrapper for PostgreSQL, are there any tools which can help me?