Firebird

Firebird is a relational database offering many ANSI SQL standard features that runs on Linux, Windows, Unix
Firebird is a relational database which will offer you many ANSI SQL ordinary features that runs on Windows, Linux and a variety of Unix systems.

Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers.

Firebird has been used in production systems, under a variety of names since 1981.

Here are some key features of "Firebird":

-including derived tables
-support for Execute Block
-increased table sizes
-new improved index code
-expression indices
-numerous optimiser improvements
-enhanced security features
-support for on-line incremental backups
-new international language support