A distributed open-source database with a flexible data model for documents, graphs, and key-values.
Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Meet Neo4j: The graph database platform powering today's mission-critical enterprise applications, including artificial intelligence, fraud detection and recommendations.
OrientDB - The World's First Distributed Multi-Model NoSQL Database with a Graph Database Engine.
MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database.
HTTP + JSON document database with Map Reduce views and peer-based replication
Open-source graph database.
Document-Oriented NoSQL Database
High-performance, distributed memory object caching system
Built like a hedge fund.
FlockDB is a distributed graph database for storing adjancency lists, with goals of supporting high rate of add/update/remove operations.
NoSQL JSON database for rapid, iterative app development.