You can find below the locations where you have to go to get the drivers necessary for accessing databases in <oXygen/>
Copy the jar files from the Berkeley database install directory to the <oXygen/> install directory as described in the procedure for configuring a Berkeley DB data source.
Go to the IBM website: http://www-306.ibm.com/software/data/db2/express/download.html , in the DB2 Clients and Development Tools category select the DB2 Driver for JDBC and SQLJ download link, fill the download form and download the zip file. Unzip the zip file and use the db2jcc.jar and db2jcc_license_cu.jar files in <oXygen/> for configuring a DB2 data source.
Copy the jar files from the eXist database install directory to the <oXygen/> install directory as described in the procedure for configuring an eXist data source.
Download Java and .NET XCC distributions (XCC Connectivity Packages) from http://xqzone.marklogic.com/download/binaries/3.1/MarkXCC.Java-3.1-5.zip available on the page http://xqzone.marklogic.com/download/. Details about configuring a MarkLogic data source are here.
Download the SQL Server 2005 JDBC driver called sqljdbc.jar
from the Microsoft website: http://msdn.microsoft.com/data/ref/jdbc/ and use it for configuring an SQL Server data source.
Download the Oracle 10 JDBC driver called ojdbc14.jar from the Oracle website: http://otn.oracle.com/software/tech/java/sqlj_jdbc/index.html and use it for configuring an Oracle data source.
Copy the jar files from the TigerLogic JDK lib directory from the server side to the <oXygen/> install directory as described in the procedure for configuring a TigerLogic data source.
Copy the jar files from the SDK\TaminoAPI4J\lib subdirectory of the Tamino database install directory to the <oXygen/> install directory as described in the procedure for configuring a Tamino data source.
Copy the jar files from the X-Hive database install directory to the <oXygen/> install directory as described in the procedure for configuring an XHive data source.