The SoS/KOA vote tally application is a software program used to tally the secure election results produced by the KoA (Kiezen op Afstand) application, developed by LogicaCMG, on behalf of the Ministry of the Interior and Kingdom Relations (Ministerie van Binnenlandse Zaken en Koninkrijksrelaties).

This system was written by the SoS Group at the Computing Science Institute of the University of Nijmegen.

The SoS Group is led by Prof. Bart Jacobs. The development of the SoS/KOA application was led by Dr. Engelbert Hubbers. Dr. Joseph Kiniry and Dr. Martijn Oostdijk were the other two primary developers. Mr. Cees-Bart Breunesse and Mr. Flavio Garcia provided some technical support as well.