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Jade is a cross-platform diagram editor built on the Qt framework.
Jade is a cross-platform diagram editor built on the Qt framework. It is similar in scope to Microsoft Visio or Gnome dia. It is released under the GNU General Public License version 3.0 and is available for Windows, Linux, and likely any other platform that is supported by the Qt library.
Free drawing software for Windows, Mac OS X, and Linux
...Software developers and database specialists can use Dia as a CASE tool to generate code skeletons from their drawings. Dia can be scripted and extended using Python.
DiaCanvas is a library for drawing diagrams. It is completely Model/View/Controller based and has a Visio (DIA) look. The package also contains a Python wrapper for the library.