1. PostgreSQL
An open-source relational database management system with advanced features for handling complex data.
2. MySQL
An open-source relational database management system that is widely used for web applications.
3. SQLite
An open-source file-based database system that is simple to use and doesn't require a separate server.
4. Oracle
A commercial relational database management system with advanced features for handling large amounts of data.
5. Microsoft SQL Server
A commercial relational database management system developed by Microsoft with support for Windows and Linux.