ConceptDraw V 

ConceptDraw is a comprehensive business and technical diagramming software with advanced drawing tools, task-specific wizards and extensive libraries of ready-made shapes. Supports MS Visio diagrams. Mac OS X and Windows versions
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Schematic 

Schematic is a diagramming tool that allows complex diagrams to be drawn with ease. Schematic allows you to combine text, pictures, shapes and connectors to create clear and informative diagrams. UML, Electrical, Network, DFD, ERD plus many more...
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