Datomic

distributed database designed to enable scalable, flexible and intelligent applications.

clojure.jdbc

cravendb

Aerospike

Aerospike Database Server – flash-optimized, in-memory, nosql database

Alchemy-Database

AlchemyDB is now Aerospike

cstore_fdw

Fast columnar store for analytics with PostgreSQL website

LMDB

Very fast embedded key/value store with full ACID semantics.

memcache

Free & open source, high-performance, distributed memory object caching system

monetdb

website

mongo

The Mongo Database http://www.mongodb.org/

facebook/mysql-5.6

Facebook's branch of the Oracle MySQL v5.6 database

twitter/mysql

MySQL fork maintained and used at Twitter https://github.com/twitter/mysql/wiki

postgres

Mirror of the official PostgreSQL GIT repository. Note that this is just a mirror - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch

Redis

Redis is an in-memory database that persists on disk. The data model is key-value, but many different kind of values are supported: Strings, Lists, Sets, Sorted Sets, Hashes website

redis-nds

This is a version of Redis patched to implement NDS (the Naive Disk Store). Documentation on this feature is contained within README.nds.

rethinkdb

An open-source distributed JSON document database with a pleasant and powerful query language. http://www.rethinkdb.com

rocksdb

Embedded key-value store for fast storage http://rocksdb.org

ssdb

SSDB - A fast NoSQL database, an alternative to Redis http://ssdb.io

SQLite

A completely embedded, full-featured relational database in a few 100k that you can include right into your project.

tokudb-engine

TokuDB is a high-performance, write optimized, compressing, transactional storage engine for MySQL and MariaDB

TokuMX

TokuMX is a high-performance, concurrent, compressing, drop-in replacement engine for MongoDB

VoltDB

VoltDB is a horizontally-scalable, in-memory SQL RDBMS designed for applications that have extremely high read and write throughput requirements.

RavenDB

A linq enabled document database for .NET http://ayende.com/Blog/

OrigoDB

An in-memory embedded database engine for NET/Mono

riak

Riak is a decentralized datastore from Basho Technologies.

Pulsedb

Pulsedb is a time series database server and library.

bolt

A low-level key/value database for Go.

diskv

A home-grown disk-backed key-value store.

go-cache

An in-memory key:value store/cache (similar to Memcached) library for Go, suitable for single-machine applications.

goleveldb

An implementation of the LevelDB key/value database in the Go.

groupcache

Groupcache is a caching and cache-filling library, intended as a replacement for memcached in many cases.

influxdb

Scalable datastore for metrics, events, and real-time analytics

ledisdb

Ledisdb is a high performance NoSQL like Redis based on LevelDB.

roshi

Roshi is a large-scale CRDT set implementation for timestamped events.

skydb.io

Sky is an open source database used for flexible, high performance analysis of behavioral data.

tiedot

Your NoSQL database powered by Golang.

cassandra

Cassandra is a partitioned row store. Rows are organized into tables with a required primary key.

elasticsearch

Open Source, Distributed, RESTful Search Engine website

lmdbjni

LMDB for Java, which is a very fast embedded key/value store with full ACID semantics.

mapdb

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.http://www.mapdb.org

neo4j

Neo4j is the world’s leading Graph Database.

orientdb

OrientDB is an Open Source NoSQL DBMS with the features of both Document and Graph DBMSs.

voldemort

An open source clone of Amazon's Dynamo. website

Titan

Distributed Graph Database http://titandb.io

couchdb

Apache CouchDB™ is a database that uses JSON for documents,JavaScript for MapReduce indexes, and regular HTTP for its API [website] (http://couchdb.apache.org/)

mongo

The Mongo Database http://www.mongodb.org/

BlinkDB

BlinkDB: Sub-Second Approximate Queries on Very Large Data [website] (http://blinkdb.cs.berkeley.edu/)

db-readings

A list of papers essential to understanding databases and building new data systems