A set of extensions to Doctrine 2 that add support for functions available in MySQL, Oracle, PostgreSQL and SQLite.

GraalVM is a high-performance JDK distribution designed to accelerate the execution of applications written in Java and other JVM languages along with support for JavaScript, Ruby, Python, and a number of other popular languages.

GraalVM @ GitHub

PostgreSQL Foreign Data Wrapper for Oracle.

oracle_fdw is a PostgreSQL extension that provides a Foreign Data Wrapper for easy and efficient access to Oracle databases, including pushdown of WHERE conditions and required columns as well as comprehensive EXPLAIN support.

db_migrator is a PostgreSQL extension that provides functions for migrating databases from other data sources to PostgreSQL. This requires a foreign data wrapper for the data source you want to migrate.