MariaDB

MariaDB is an open-source relational database that speaks the MySQL wire protocol and SQL dialect, so most MySQL clients, connectors, and dumps work against it unchanged. Data lives in transactional InnoDB tables with foreign keys, and the server adds extras such as sequence objects, virtual columns, and pluggable storage engines.

Teams use it as a general purpose database for web applications, content sites, and internal tools, especially where a community-governed project and predictable licensing matter.

The service can MariaDB as a managed service on your own servers, keeping the primary store close to the application and free of any per-seat charge.