About abacus
This app simulates a Chinese abacus (suanpan). With the context menu you
can choose between several different colors as well as between ten or
thirteen rows of beads. You can also reset the beads of the abacus. If
you don't know how to use it you can have a look at this
article which explains the basics:
http://tuxgraphics.org/giniandkarlsworld/mathblog/abacusexplained.shtml
No advertisement, no special permissions.
Enjoy!