For basic conceptual and logical modeling, draw.io is a free, open-source diagramming tool. It includes dedicated shape libraries for Entity-Relationship Diagrams (ERDs) and UML diagrams. While it lacks automated SQL generation, it is excellent for visual planning. 2. MySQL Workbench
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Conceptual, Logical, and Physical Data Models (CDM, LDM, PDM). For basic conceptual and logical modeling, draw