These are additional shapes for Dia.
More information is available from dia-installer.de/shapes
The build system allows to package the shapes for use with Diashapes.
This package was previously named dia-additional-shapes.
Like Dia, this package is licensed under the terms of the GNU General Public License, version 2.
Detailed information for some of the included sheets:
To turn all white pixels in a PNG icon transparent, use ImageMagick:
convert -alpha on -channel RGBA -fuzz 8% -fill none -opaque "#ffffff" \
+repage foo.png foo.png
src/floodfillicon.sh can be used to To floodfill all white areas from the outside.