SAP PowerDesigner is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is Skipper. It's not free, so if you're looking for a free alternative, you could try SQL Studio or DbVisualizer. If that doesn't suit you, our users have ranked more than 25 alternatives to SAP PowerDesigner and 15 are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to SAP PowerDesigner are pgModeler, SQL Developer Data Modeler, DbSchema and Vertabelo.
Limited to ORM not suited for relational database design