DocumentDB – a MongoDB compatible open-source database

DocumentDB is an open-source, MIT-licensed database built on PostgreSQL that provides MongoDB compatibility with native BSON support, advanced indexing, and vector search capabilities. It combines document flexibility with PostgreSQL's SQL capabilities and reliability, running locally via Docker for development or deployable to Kubernetes and cloud environments. The project is actively maintained by a technical steering committee representing five organizations including Microsoft and Amazon, with over 3,400 GitHub stars.