MySQL is a open-source, free and very popular relational database management system which is developed, distributed and supported by Oracle corporation.

MySQL

PostgreSQL is a open source relational database system and is also knows as Postgres.

PostgreSQL

MongoDB is a opensource document-oriented NoSQL database. MongoDB is available as free Community version, also as an Enterprise version

MongoDB

Firebase is a mobile and web application development platform developed by Firebase, Inc. in 2011, then acquired by Google in 2014.[5] As of October 2018, the Firebase platform has 18 products,[6] which are used by 1.5 million apps.[7]


Firebase

SQLite

Elasticsearch

Access

Cloud Firestore

Spark SQL

Redis is an in-Memory data structure project implementing a distributed, in-memory key-value database.

Redis

Neo4j is one of the popular Graph Databases and Cypher Query Language (CQL)

Neo4j

Hive

Apache Cassandra is a free and open-source, distributed, wide column store, NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure.

Cassandra

Solr

NoSQL

Document

Key-Value

Document store

Key-value store

ORDMS

Search Engine

Index

JSON

Document Store

RDBMS

Cross-platform

Mainframe

z/OS

Time Series

scalable

analytics

Graph

ACID

ORDBMS

Attachment

Message Queue

Message Broker

Pub-Sub

Caching

Nosql

hypertables

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