ConceptDraw PRO is diagramming software used to create business graphics, including ConceptDraw Flowcharting Suite.

StarUML is an opensource UML tool.

Visual Paradigm (VP-UML) is a UML CASE Tool.

Modelio is an Open Source UML tool.

PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language.

Enterprise Architect is a visual modeling and design tool based on the OMG UML.

Astah Community is a free software design tool which supports the latest UML diagrams.