Advantage Database Server is a full-featured, high performance client/server data management system for stand-alone, networked, and internet applications. Advantage is specifically designed to meet the needs of business application developers and allows developers to easily deploy robust applications with complete control of data integrity, multi-user concurrency, and data security. For those wanting an affordable database solution without sacrificing functionality, Advantage provides the database functionality developers require without the high ownership costs of other database products.
www.advantagedatabase.com.

Apollo is a line of high-performance, easy-to-use xBase data engines that support Clipper®, FoxPro® and SIx® data files. Apollo is designed for professional software developers building Windows and Internet applications with .NET, Delphi, VB, VC++, ASP, ADO and more. Apollo supports FoxPro (DBF/FPT/CDX/IDX), Clipper (DBF/DBT/NTX/NSX) and HiPer-SIx (DBF/SMT/NSX) file formats.
www.vistasoftware.com/introduction.asp

IntraWeb makes your applications available to the Web, PDA's, and even mobile phones (WAP). Applications built with IntraWeb can be deployed to servers running  Windows, .NET or Linux platforms.
www.atozed.com/intraweb/index.aspx

Delphi® XE2
The fastest way to build native Windows, Mac and mobile applications.
http://embarcadero.com/products/delphi

kbmMemTable is a very complete memory table. That means it can store/manipulate/search in data organized as records consisting of fields.
www.components4developers.com

Elevate Software develops and markets DBISAM, which is an embedded database engine for use by developers within their applications. DBISAM compiles directly into your application with no external libraries required. It has a very small footprint and does not require any forms support in Delphi 6, C++Builder 6, and Kylix 2 and higher, which helps keep the size of non-UI applications like services or web applications to a minimum.
www.elevatesoftware.com/

Diamond ADO is a Delphi component library, that provides high-speed performance when working with any OLE DB provider or ODBC data source. Diamond ADO uses ActiveX Data Objects 2.X (ADO) to access data without requiring the BDE. Using Diamond ADO you can connect to any OLE DB provider. Currently OLE DB providers exist for SQL Server, Oracle, Access, ODBC, Active Directory Services and the Index Server.
www.islamov.com/diamondado/index.html

Firebird is a relational database offering many ANSI SQL standard 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. It has been used in production systems, under a variety of names since 1981.
www.firebirdsql.org
 

Our database solutions range from the tiny to the large with the flexibility to meet almost any need. Create handheld computer software, networked multi-user programs, enterprise-level client/server applications, or anything in between.
www.codebase.com/?pid=sequiter_com

TOPAZ is a component library for Borland's Delphi (also works with Kylix 1, 2 and C++ Builder) that is especially designed to provide support for accessing dBASE database files and indexes. TOPAZ is especially easy to understand, and simple to use, and is designed with intuitive dBASE conventions.
www.softsci.com

InfoPower's masterpiece grid is one of the most powerful components in the InfoPower library, greatly expanding upon the capabilities of Delphi's native grid component.
www.woll2woll.com/index.html

NexusDB is an ultra-fast, client/server database engine originally designed for the Delphi and C++Builder developer. For the current version 2 it has been extended to provide most of it's functionality to .NET programmers no matter which programming language they use. NexusDB is nimble enough to be fully embedded into your desktop applications and powerful enough to be your primary database server.
www.nexusdb.com