This GEMA-FeeCalculator was developed for the DMXControl April Fool's joke of 2013. It can calculate GEMA fee for light show projects (created for the April Fool's joke). The calculated values are fictitious, however, it would be a pity to throw away the plugin. Hence, it can be downloaded here.
Additional information for the plugin can be found in the Aprilscherz 2013 thread (german) in the DMXControl-Forum.