RFFlow is a powerful, easy to use, tool for drawing flowcharts, organization charts, cause-effect (fishbone) diagrams, PERT charts, Gantt charts, and many other diagrams. You will quickly create charts for documents, presentations, or the Web.

EDraw is a new UML diagram and software diagram drawing tool. Easy to draw uml model diagram, COM and OLE, data flow model diagram, Jacobson Use Case, SSADM Diagram, Nassi-Schneiderman, Booch OOD, ROOM Diagram, Yourdon and Coad and Shlaer-Mellor OOA.

A full feature cross-platform UML CASE tool with Java code generation.

UML State Machine Wizard VC add-in for embedded systems development and simulation.

MagicDraw is a visual UML modeling and CASE tool with teamwork support. MagicDraw provides full support for UML 2.0 metamodel, including class, use case, communication, sequence, state, activity, implementation, package, and other diagrams.

Free Java IDE and UML CASE Tool is now available for FREE Download! (by Visual Paradigm)

Ensure your success in IBM OOAD (with UML) certification exam with Whizlabs simulator comprising of 5 mock exams (280 questions) on the latest pattern.

You can use this application to create UML,ER,ERD,state diagrams,network topology schema,Cisco networks,component models,process models,business models. In many ways - this application contain more functions than Microsoft Visio and it is free.