MariaDB is a community-developed fork of the MySQL relational database management system intended to remain free under the GNU GPL. Developed by MariaDB Foundation
License: Open Source
MongoDB is a NoSQL database designed for high scalability and flexibility with its document-oriented approach, while MariaDB is a relational database that offers strong ACID compliance and robust SQL features. The choice between them depends on the specific application needs, such as schema flexibility versus structured data requirements.