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

Access

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

MongoDB

Spark SQL

Solr

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

RabbitMQ is an open-source message-broker software that originally implemented the Advanced Message Queuing Protocol.

RabbitMQ

DynamoDB

Elasticsearch

Oracle NoSQL

Cloud Firestore

Db2 is a RDBMS which was initially designed to work on Mainframe Platforms for Banking Applications, later ported to work on other operating systems like Windows, Linux also

IBM Db2

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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