1. MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database.

    open-source

  2. Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.

  3. A distributed open-source database with a flexible data model for documents, graphs, and key-values.

  4. HTTP + JSON document database with Map Reduce views and peer-based replication

  5. PostgreSQL is a powerful, open source object-relational database system.

  6. The open-source database for the realtime web

  7. Document-Oriented NoSQL Database

  8. Microsoft Azure is an open, flexible, enterprise-grade cloud computing platform. Move faster, do more, and save money with IaaS + PaaS. Try for FREE.

  9. An enhanced, drop-in replacement for MySQL

  10. OrientDB - The World's First Distributed Multi-Model NoSQL Database with a Graph Database Engine.

  11. Amazon DynamoDB is a fast and flexible NoSQL database service for all applications that need consistent, single-digit millisecond latency at any scale. It is a fully managed cloud database and supports both document and key-value store models.

  12. Meet Neo4j: The graph database platform powering today's mission-critical enterprise applications, including artificial intelligence, fraud detection and recommendations.