I know this is too obvious coming from me but Data Modeler is my favourite tool and I use it every single day. Without Data Modeler I could not do my work and design databases well and efficiently and without it I could not show other people how easy and important it is to design databases. 18.3 just came out and it is ever better than the previous versions!
https://www.oracle.com/technetwork/developer-tools/datamodeler/downloads/index.html
Thank you ODC for Oracle SQL Developer Data Modeler!
HeliFromFinland 
Hi may i have your precious support on this questions:
a) https://community.oracle.com/tech/developers/discussion/4482103/oracle-data-modeler-ddl-script-preview#latest
b) https://community.oracle.com/tech/developers/discussion/4482102/save-a-project-with-model-in-one-file-persistent-propriety-mode#latest
thanks in advance
Hi Mario. Sorry for the delay. Did you get answers to your questions? Best regards, Heli