Dia Portable is a diagramming program with excellent features that would make creating diagrams a great experience for you. You can use it to create different types of diagrams like UML diagrams, entity relationship diagrams, flowcharts, network diagrams, and others. You can even add support for new shapes by writing xml files. The program can draw and save a diagram to XML format and can export the diagrams to a variety of formats such as SVG, EPS, PNG, WMF, etc. It is possible to print the diagrams too. A great tool to put your ideas to diagrams in a simple and quick way.
