Claim: MariaDB is a free open-source software related to the IBM RDBMS, and has had ten different versions up to the current 10.5.
Evidence: MariaDB is a community-developed, commercially supported fork of the MySQL relational database management system (RDBMS), intended to remain free and open-source software under the GNU General Public License. In 1974, IBM began developing System R, a research project to develop a prototype RDBMS. RDBMS Old version, no longer maintained: 5.1 Old version, no longer maintained: 5.2 Old version, no longer maintained: 5.3 Old version, no longer maintained: 5.5 Old version, no longer maintained: 10.0 Old version, no longer maintained: 10.1 Older version, yet still maintained: 10.2 Older version, yet still maintained: 10.3 Older version, yet still maintained: 10.4 Current stable version: 10.5