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

MySQL

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

MongoDB

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

PostgreSQL

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

Elasticsearch

Access

SQLite

Hive

Snowflake

Cloud Firestore

Realm

HBase

Teradata

Spark SQL

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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