1. SQLite: SQLite is a software library that provides a relational database management system. The lite in SQLite means light weight in terms of setup, database administration, and required resource.

2. MySQL: It is the most popular Open Source Relational SQL database management system. MySQL is one of the best RDBMS for developing web-based software applications. MySQL is used in almost all the open source web projects that require a database in the back-end.

3. Oracle Berkeley DB: It provides the best open source embeddable databases allowing developers the choice of SQL, Key/Value, XML/XQuery or Java Object storage for their data model.

4. Couchbase Mobile: It includes an embedded database, Couchbase Lite, with full CRUD and query capabilities, and a web gateway, Sync Gateway, for secure data synchronization.

5. Realm: It is a mobile database and a replacement for SQLite. Realm is not an ORM on top of SQLite. Instead it uses its own persistence engine to provide speed and performance.

6. Firebase: Firebase is a mobile and web application development platform developed by Firebase, Inc. in 2011, then acquired by Google in 2014. Firebase is more than just a "mobile database" — it is a suite of cloud-based services.

7. IBM DB2: This is a family of data management products, including the DB2 relational database. The products feature AI-powered capabilities to help you modernize the management of both structured and unstructured data across on premises and multicloud environments.

8. PostgreSQL: This is a powerful, open source object-relational database system that uses and extends the SQL language combined with many features that safely store and scale the most complicated data workloads.

Question

1. SQLite: SQLite is a software library that provides a relational database management system. The lite in SQLite means light weight in terms of setup, database administration, and required resource.

2. MySQL: It is the most popular Open Source Relational SQL database management system. MySQL is one of the best RDBMS for developing web-based software applications. MySQL is used in almost all the open source web projects that require a database in the back-end.

3. Oracle Berkeley DB: It provides the best open source embeddable databases allowing developers the choice of SQL, Key/Value, XML/XQuery or Java Object storage for their data model.

4. Couchbase Mobile: It includes an embedded database, Couchbase Lite, with full CRUD and query capabilities, and a web gateway, Sync Gateway, for secure data synchronization.

5. Realm: It is a mobile database and a replacement for SQLite. Realm is not an ORM on top of SQLite. Instead it uses its own persistence engine to provide speed and performance.

6. Firebase: Firebase is a mobile and web application development platform developed by Firebase, Inc. in 2011, then acquired by Google in 2014. Firebase is more than just a "mobile database" — it is a suite of cloud-based services.

7. IBM DB2: This is a family of data management products, including the DB2 relational database. The products feature AI-powered capabilities to help you modernize the management of both structured and unstructured data across on premises and multicloud environments.

8. PostgreSQL: This is a powerful, open source object-relational database system that uses and extends the SQL language combined with many features that safely store and scale the most complicated data workloads.

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