RocksDB/LevelDB inspired key-value database in Go

Dragonfly is a drop-in Redis® replacement that is high-performance, low-complexity, and built for scale.

JunoDB is PayPal's home-grown secure, consistent and highly available key-value store providing low, single digit millisecond, latency at any scale

Probably, the fastest in-memory store in the universe!

Redis and Memcached compatible store.

PranaDB is a distributed streaming database, designed from the outset to be horizontally scalable

Beam is designed to store large graphs that cannot fit on a single server. It's scalable in how much data it can store and the rate of queries it can execute

Elliptics network is a fault tolerant distributed key/value storage. With default key generation policy it implements hash table object storage

A Cassandra compatible NoSQL column store, at 1MM transactions/sec per server.

Sophia is a modern embeddable key-value database, fast and feature-rich.

Engineered to meet the elastic scalability, consistent high performance, always-on availability, and data mobility requirements of mission critical applications.

EJDB is the C library based on modified version of Tokyo Cabinet. JSON representation of queries and data implemented with API based on C BSON

A consistent distributed data store.

This adds support for building MongoDB on NetBSD.

I've kept quiet for awhile for various political reasons, but I now feel a kind of social responsibility to deter people from banking their business on MongoDB.

is in production use today, powering user-data storage solutions for real-time bidding for digital advertising. Common deployments are terabytes of data, billions of objects, and 100K- plus transactions per second with sub-millisecond latency.

you write a distributed map-reduce function in erlang

Redis is an advanced key-value store. It is similar to memcached but the dataset is not volatile, and values can be strings, exactly like in memcached, but also lists, sets, and ordered sets. All this data types can be manipulated with atomic operations to push/pop elements, add/remove elements, perform server side union, intersection, difference between sets, and so forth.

An Architectural Hybrid of MapReduce and DBMS Technologies for Analytical Workloads.

Bigdata was designed from the ground up as a distributed database architecture optimized for very high aggregate IO rates

This paper described Dynamo, a highly available and scalable data store, used for storing state of a number of core services of Amazon.com’s e-commerce platform

CouchDB is a distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP/JSON API.

MongoDB is a high-performance, open source, schema-free document database designed for cloud computing