http:/ / www.firebirdsql.org/
Firebird is a relational database offering many ANSI SQL-99 features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers. Firebird is completely free of any registration, licensing or deployment fees. It may be deployed freely for use with any third-party software, whether commercial or not.
