Soroban is the desktop abacus software of computer-control. By using this free software is software on the desktop abacus of computer runs.
The counter(beads) can be shed in the manual operation like using an actual abacus.
As for computer-controlled, it corresponds to addition, subtraction, multiplication, division, and square roots, and a super-high-speed calculation is possible.
Number of rods, counter image, and animation interval etc. of the abacus can be customized.
* .NET Framework
The license of this software is Freeware, you can free download and free use this calculator software.