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
MariaDB is a relational database that excels in structured data management and complex queries, making it ideal for transactional applications. In contrast, Couchbase is a NoSQL database designed for high-performance and scalability with its flexible JSON document model, making it suitable for large-scale, unstructured data use cases.