OSQL
- Discusses a wrapper for the Oracle Call Interface including source-download.
- http://www.codeguru.com/Cpp/data/mfc_database/oracle/article.php/c1159

MySQL++
- A C++ API for MySQL. Tries to make working with queries as easy as working with other STL containers.
- http://tangentsoft.net/mysql++/

MetaKit structured storage
- Highly portable, lightweight database manager, usable from several languages.
- http://www.equi4.com/metakit.html

freeodbc++
- A C++ library for accessing SQL databases. Designed with standards in mind, so it provides a subset of the well-known JDBC 2.0 and runs on top of ODBC. [Open Source, LGPL]
- http://libodbcxx.sourceforge.net/

C++ ResourcePool
- An abstracted C++ database API with advanced transaction management and reliability features. [Open source, GPL]
- http://www.fatalmind.com/software/ResourcePool/cplusplus/

ORA++
- OCI C++ Interface Library. Download, sample applications, bug tracker.
- http://orapp.sourceforge.net/

Ora++ Library
- A set of C++ classes wrapped around the Oracle Call Interface (OCI). They provide an object-oriented interface to Oracle similar to other OO interfaces like JDBC or PERL.
- http://mywebpages.comcast.net/jimcainadmin/orapp/

OTL
- Oracle, Odbc and DB2-CLI Template Library. A set of classes that wrap around the dynamic database programming interfaces of Oracle, DB2 and ODBC. Also provides support for block-updates and other caching mechanisms.
- http://otl.sourceforge.net/

Database Template Library
- Provides ODBC recordsets just like STL containers, including writing the contents back to the database.
- http://dtemplatelib.sourceforge.net/index.htm

ODBC Broker
- C/C++ library to access ODBC data sources with only a few lines of code. Now, make dynamic database engines to access any ODBC data sources without knowing about ODBC!
- http://www.sqldata.com/broker.htm

OLEDB
- A class library used to open a Microsoft Access or SQL database. [Open source]
- http://www.thesett.co.uk/swdev/