Also, from: https://www.firebirdsql.org/en/features/ https://www.firebirdsql.org/en/features/ [ Firebird is free for commercial and educational usage: no lic

Also, from: https://www.firebirdsql.org/en/features/ https://www.firebirdsql.org/en/features/ [ Firebird is free for commercial and educational usage: no license fees, installation or activation restrictions. No double licensing - Firebird license is based on Mozilla Public License. The mix of high performance, small footprint, supreme scalability, silent and simple installation and 100% royalty-free deployment make Firebird a highly attractive choice for all types of software developers and vendors. It is used by approximately 1 million of software developers worldwide. ]