VoltDB

In-memory relational DBMS capable of supporting millions of database operations per second

Aerospike

Aerospike is a high-performing NoSQL database supporting high transaction volumes with low latency.

Apache HBase – Apache HBase™ Home

high-performance, integrated and distributed in-memory platform for computing and transacting on…

NoSQL JSON database for rapid, iterative app development.

High performance, in-memory storage engine for time series data (by Facebook)

A fast, embeddable, in-memory key/value database for Go with custom indexing and geospatial support

Ultra-fast SQL-like queries on Java collections. Contribute to npgall/cqengine development by creating an account on GitHub.

Document-Oriented NoSQL Database

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

Clustering and highly scalable data distribution platform for Java

In-memory JavaScript Datastore with Persistence

Database for real-time transactions and analytics.

The world’s most popular open source database

MySQL :: MySQL Community Edition

OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.

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

An open-source systems monitoring and alerting toolkit.

High performance data logging and graphing system for time series data

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

The open-source database for the realtime web

SAP HANA is an in-memory, column-oriented, relational database management system.

SQLite Home Page

A NoSQL database running in a Lua application server.