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. Redis supports different kind of sorting abilities.

SenseiDB is an open source, distributed, realtime, semi-structured database.

This is the MongoDB driver for Erlang. MongoDB is a document-oriented database management system. A driver is a client library that provides an API for connecting to MongoDB servers, performing queries and updates on those servers, and performing administrative tasks like creating indexes and viewing statistics. This version of the driver supports connecting to a single server or replica set, and pooling of both types of connections. Both connection types and pools are thread-safe, i.e. multiple processes can use the same connection/pool simultaneously without interfering with each other. This driver is implemented as an Erlang application named mongodb. It depends on another Erlang library application named bson, which defines the document type and its standard binary representation. You need both of these.

Hypertable is an open source database based on published best practices and our own experience in solving large-scale data-intensive tasks.

Scalarix is a transactional data store for online services based on the peer-to-peer principle. It provides self-management and scalability by replicating services among peers. Without system interruption it scales from a few PCs to thousands of servers. Servers can be added or removed on the fly without any service downtime.

An open-source database with a flexible data model for documents, graphs, and key-values. Build high performance applications using a convenient sql-like query language or JavaScript/Ruby extensions.

NoSQLMap is an open source Python tool designed to audit for as well as automate injection attacks and exploit default configuration weaknesses in NoSQL databases, as well as web applications using NoSQL in order to disclose data from the database.

The goal of Couch Potato is to create a minimal framework in order to store and retrieve Ruby objects to/from CouchDB and create and query views.

Kyoto Cabinet is a library of routines for managing a database. The database is a simple data file containing records, each is a pair of a key and a value. Every key and value is serial bytes with variable length. Both binary data and character string can be used as a key and a value. Each key must be unique within a database. There is neither concept of data tables nor data types. Records are organized in hash table or B+ tree

CodernityDB is opensource, pure Python (no 3rd party dependency), fast (even 100 000 insert and more than 100 000 get operations per second), multi platform, schema-less, NoSQL database