A truly Open Source MongoDB alternative.
FerretDB (previously MangoDB) was founded to become the de-facto open-source substitute to MongoDB. FerretDB is an open-source proxy, converting the MongoDB 6.0+ wire protocol queries to SQL - using PostgreSQL as a database engine.

The PHP Content Repository is an adaption of the Java Content Repository (JCR) standard, an open API specification defined in JSR-283.
The API defines how to handle hierarchical semi-structured data in a consistent way.

The typical use case is content management systems. PHPCR combines the best out of document-oriented databases (weak structured data) and of XML databases (hierarchical trees). On top of that, it adds useful features like searching, versioning, access control and locking on top of it.

• PHP Content Repository PHPCR @ GitHub.

WiredTiger is an high performance, scalable, production quality, NoSQL, Open Source extensible platform for data management.

MongoDB GUI Admin for 21st century.
The best GUI for MongoDB
Get your MongoDB data under control

Node.js cms and web application platform built on Express and MongoDB.
The open source framework for developing database-driven websites, applications and APIs in Node.js. Built on Express and MongoDB.

The Ultimate Open Source Web Chat Platform.
From group messages and video calls all the way to helpdesk killer features.
Our goal is to become the number one cross-platform open source chat solution.

Let's Chat is a persistent messaging application that runs on Node.js and MongoDB. It's designed to be easily deployable and fits well with small, intimate teams.