I need a powerful development manager like Sybase Power Designer or IBM Rational Rose that support sequence diagrams, data flow diagrams and so on.
Can somebody suggest a good alternative?
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Dia is a diagram editor that can be used to draw flow charts, UML diagrams etc.
Also take a look at OpenModelsphere. It is more oriented towards data modeling and can be used for both forward and reverse engineering of physical databases plus it supports a (almost) full range of UML, data modeling and business process modeling diagrams.
Oh, and its GPL v3, so no "community" versions or "non-commercial" or other "Thou shall not ..." restrictions :-)