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Using Oracle DBExpress for FMW MDR
It's not officially supported but many people including me use it without any issue for development or demonstrations.

Before installing you need to change DB params:
$ORACLE_HOME/bin/sqlplus /nolog

SQL> connect sys/oracle as sysdba;
SQL> EXEC DBMS_XDB.SETLISTENERLOCALACCESS(FALSE);
SQL> alter system set processes = 200 scope = spfile;
SQL> commit;
SQL> shutdown immediate

$ORACLE_HOME/bin/sqlplus /nolog

SQL> connect sys/oracle as sysdba;
SQL> startup
SQL> show parameter sessions
*** (make sure sessions is 225) ***
SQL> exit