A program for drawing structured diagrams. PortableDIA is a program for drawing structured diagrams.
Dia is an application for creating technical diagrams. Its interface and features are loosely patterned after the Windows program Visio.
Dia is inspired by the commercial Windows program 'Visio', though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams. It is also possible to add support for new shapes by writing simple XML files, using a subset of SVG to draw the shape.

It can load and save diagrams to a custom XML format (gzipped by default, to save space), can export diagrams to a number of formats, including EPS, SVG, XFIG, WMF and PNG, and can print diagrams (including ones that span multiple pages).

PortableDIA Features:
* Multiple-page printing
* Export to many formats (EPS, SVG, CGM and PNG)
* Ability to use custom shapes

The license of this software is Free, you can free download and free use this flowchart & diagram software.