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
Report Manager is both a print scheme designer (report) and a high level printing (reporting) engine. Also a TCP Report Server and a Web Report Server (PDF on the fly), supports Windows and Linux.
Connectivity to almost all databases is provided.