From Slik Software:
DBExplorer is a powerful database utility that allows you to compare any two databases and report the structural and data differences between them. It then enables you to synchronize the differences from the left to the right and the right to the left. This can be done with selected fields and data. DBExplorer works with any OLE DB or ODBC compliant database which includes all the mainstream databases including SQL server, Oracle, DB2, Access etc.