A full-fledged network simulation software from Cisco
UniDac Professional with source code
UniDAC provides cross-database access for Delphi, C++Builder, Lazarus, supporting Windows, Mac OS X, iOS, Linux, FreeBSD
SQL Developer
Manage your queries and databases with ease with the SQL Developer
Microsoft SQL Server 2005 Express Edition
Free and professional data management bundle for Microsoft systems
InterBase Data Access Components
Delphi, C++Builder and Lazarus library for connection to InterBase and Firebird