Here are the top 15 best databases for web applications to use in 2023:

1. MySQL: A popular open-source relational database management system.

2. PostgreSQL: A powerful and reliable open-source object-relational database management system.

3. MongoDB: A NoSQL document-oriented database that stores data in JSON-like documents.

4. Oracle: A high-performance relational database management system.

5. Microsoft SQL Server: A popular and powerful relational database management system.

6. Cassandra: A NoSQL database designed for scalability and high availability.

7. Redis: An open-source in-memory data structure store used as a database, cache, and message broker.

8. SQLite: A lightweight and simple database management system suitable for small-scale applications.

9. Firebase: A NoSQL database provided as a cloud service by Google, which offers real-time data synchronization and mobile app development tools.

10. Amazon DynamoDB: A fully managed NoSQL database service provided by Amazon Web Services.

11. CouchDB: A NoSQL database designed to work well with web applications and mobile devices.

12. Hadoop: An open-source big data framework that includes Hadoop Distributed File System (HDFS) and MapReduce.

13. Neo4j: A graph database that stores data in nodes and relationships.

14. MariaDB: A community-developed fork of MySQL that offers enhanced features and performance improvements.

15. SQLite: A lightweight and simple database management system suitable for small-scale applications.

These databases offer various features and capabilities, and the choice of database will depend on the specific needs of the web application. 

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