Firebird is an open-source SQL relational database management system that supports Linux, Microsoft Windows, macOS and other Unix platforms.

[2] The database forked from Borland's open source edition of InterBase in 2000 but the code has been largely rewritten since Firebird 1.5.

[6][7] Firebird 1.0 was released for Linux, Microsoft Windows and Mac OS X on 11 March 2002,[8] with ports to Solaris, FreeBSD 4, HP-UX over the next two months.

[11] Firebird 2.0 was released on 12 November 2006,[12] adding support for 64-bit architectures, tables nested in FROM clauses, and programmable lock timeouts in blocking transactions.

[13] The previous stable release was version 2.1.6, which added new features including procedural triggers, recursive queries, and support for SQL:2003 MERGE statements.

[14] Firebird 2.5 introduced new features like improved multithreading, regular expression syntax and the ability to query remote databases.

[35] The multi-generational architecture ensures that OLTP and DSS/OLAP operations can be run simultaneously without the delays caused by locking mechanisms found in other products.