Microsoft SQL Server and Sybase: jTDS driver available from http://jtds.sourceforge.net/. Use version 1.2 (Download available from http://sourceforge.net/project/showfiles.php?group_id=33291)Then follow the instructions there and you should be ready to go.
When you download the jtds distribution, you download an archive file called jtds-1.2-dist.zip. The binary driver jar file is located within this file is called jtds-1.2.jar
Help -> About -> Extensionsand see if there is something like:
Oracle SQL Developer - Migrations Microsoft SQL Server oracle.sqldeveloper.migration.sqlserver