​​FerretDB - (★ 5.7K on GitHub) is a truly Open Source MongoDB alternative, built on PostgreSQL. FerretDB is an open-source proxy, converting the MongoDB 6.0+ wire protocol queries to SQL - using PostgreSQL as a database engine.

They recently announced FerretDB 1.0 GA release and now officially this project is production ready, here is the blog post with nice introduction

#db #mongodb #postgresdb #proxy