Is a stand-alone version of Geminon Management Software for Churches still available for sale?
No, there is no version available for sale because the developers are nowhere to be found. I've searched on various websites, but I didn't find anything related to sales and versions. It's also specified that the support for the product ceased without a proper notification.
You can use the following result list to select other applications from the same category: http://software.informer.com/search/church+software