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.

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

Umbrello UML Modeller is a free software UML diagram tool available natively for Unix-like platforms and Windows.