Firebird 2.5

Firebird is an open source SQL relational database management system that runs on Linux, Windows, and a variety of Unix.Firebird provides Full support for stored procedures and triggers,Full ACID compliant transactions,Referential integrity,Multi Generational Architecture (sometimes called MVCC),Support for External Functions,SQL activity can send asynchronous notification events to clients,Third party tools, including GUI administrative tools and replication tools,Careful writes - fast recovery, no need for transaction logs and much more