Dia is a gtk+ based diagram creation program released under the GPL. It can be used to draw many different kinds of diagrams.
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).
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| From Linux and Lamp – Open Source Software |
Dia is a program to draw structured diagrams. Dia is free software available under the terms of the GNU General Public License, the GPL.
