erwin Data Modeler, Enterprise Architect, DB Designer, DbVisualizer, IBM Rational Software Architect, ArgoUML, dbForge Studio for MySQL, SQL Developer Data Modeler, Aqua Data Studio, SQL Power Architect, pgModeler, Vertabelo, DbSchema, DbWrench, Open System Architect, Database Designer for PostgreSQL, DeZign for Databases, Skipper, Navicat Data Modeler, ER/Studio Data Architect, dbDiffo are some alternatives to SAP PowerDesigner.