Firebird for Mac (64-bit) is a 64-bit version of the Firebird relational database management system (RDBMS) that runs on macOS. It[SQ]s a free and open-source database known for its reliability, scalability, and embedded capabilities. The "64-bit" specification means it[SQ]s optimized to utilize the full addressing capabilities of modern 64-bit processors, allowing it to handle larger datasets and perform better than its 32-bit predecessor. Essentially, it[SQ]s a powerful, free database option for Mac users needing a robust solution.