Ubuntu – Dia – Open Source diagramming Software

sudo apt-get install -y dia

References

Home: https://live.gnome.org/Dia
Related Links: http://en.wikipedia.org/wiki/Dia_(software)
Manual Installer: http://sourceforge.net/projects/dia-installer/
Linux Installation: http://dia-installer.de/download/linux.html

1. Samples and Examples: https://live.gnome.org/Dia/Examples
2. Additional Stensils Repository: http://dia-installer.de/shapes/index.html.en
3. Gnome Icons: http://gnomediaicons.sourceforge.net/screenshots.html

4. Dia Installation under Windows
http://dia-installer.de/download/index.html.en
http://download.cnet.com/Dia/3000-2075_4-10833704.html

5. Alternatives: http://www.yworks.com/en/products_yed_about.html