Firebird RDBMS offers ANSI SQL features & runs on Linux, Windows & several Unix platforms. Features excellent concurrency & performance & powerful stored procedure & trigger language.
More information and downloads at https://firebirdsql.org/, issue tracker is https://github.com/FirebirdSQL/firebird/issues
SSDM (formerly SqlceViewer) is a database management studio for universal databases.Includes : MySql,Access,SqlServer,Excel,SqlCe,SqlLite,Firebird.etc.
A C++ database connectivity class library supporting different database management systems under a simple interface. The API is hiding implementation details from developers, so class usage is same for each database management system.