Popular Open Source Databases
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**Relational DBMS:**

1. SQLite

SQLite is an in-process library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine.

2. MySQL

MySQL is the world's most popular open source database. With its proven performance, reliability and ease-of-use, MySQL has become the leading database choice for web-based applications, used by high profile web properties including Facebook, Twitter, YouTube, Yahoo! and many more.

3. MariaDB

MySQL application compatible RDBMS, enhanced with high availability, security, interoperability and performance capabilities. MariaDB ColumnStore provides a column-oriented storage engine and MariaDB Xpand supports distributed SQL.

4. CockroachDB

CockroachDB is a distributed database architected for modern cloud applications. It is wire compatible with PostgreSQL and backed by a Key-Value Store, which is either RocksDB or a purpose-built derivative, called Pebble.

5. Couchbase

A distributed document store with integrated cache, a powerful search engine, in-built operational and analytical capabilities, and an embedded mobile database.

**Document Store**

6. MongoDB

One of the most popular document stores available both as a fully managed cloud service and for deployment on self-managed infrastructure.

**Graph DBMS**

7. neo4j

Scalable, ACID-compliant graph database designed with a high-performance distributed cluster architecture, available in self-hosted and cloud offerings.

**Wide Column Store**

8. Cassandra

Apache Cassandra is an open source NoSQL distributed database trusted by thousands of companies for scalability and high availability without compromising performance.

**Key-Value Store**

9. Redis

Popular in-memory data platform used as a cache, message broker, and database that can be deployed on-premises, across clouds, and hybrid environments