Postgres

An object-relational database system that boasts a vast set of features and a growing community.

20 Alternatives To Postgres

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Apache Druid

Fast column-oriented distributed data store
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ArangoDB

A distributed open-source database with a flexible data model for documents, graphs, and key-values.
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Cassandra

Manage a massive range of data fast and without losing.

CouchDB

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

DynamoDB

Amazon DynamoDB is a fast and flexible NoSQL database service for all applications that need consistent, single-digit millisecond latency at any scale. It is a fully managed cloud database and supports both document and key-value store models.
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ElasticSearch

Elasticsearch is an open source, distributed, RESTful search engine.

Graphite

Graphite is a highly scalable real-time graphing system.
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InfluxData

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

An enhanced, drop-in replacement for MySQL
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MySQL

The world’s most popular open source database

OpenTSDB

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

Oracle DBaaS

See how Oracle Database 12c enables businesses to plug into the cloud and power the real-time enterprise.

OrientDB

OrientDB - The World’s First Distributed Multi-Model NoSQL Database with a Graph Database Engine.
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PostgreSQL

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

An open-source systems monitoring and alerting toolkit.
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Redis

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

RethinkDB

The open-source database for the realtime web

SQLite

SQLite Home Page

TimescaleDB

TimescaleDB is a time-series SQL database providing fast analytics, scalability, with automated data management on a proven storage engine.
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memcached

High-performance, distributed memory object caching system