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
CouchDB is a NoSQL database designed for document storage with a focus on scalability and ease of use, while MariaDB is a relational database that emphasizes SQL compliance and strong consistency. The choice between them largely depends on whether you need a schema-free document model or a structured SQL-based environment.