Are you multiplying disciples and groups? If so, you might appreciate this free online software, developed by an implementer in Czech Republic:

The software includes an “About” page for instructions, but if you’re familiar with the “Four Fields” model, it should be fairly easy to grasp. Thanks to Curtis Sergeant for inspiring this disciple maker to design it, and to the disciple maker for making it available to the world as a gesture of, “Freely I have received, and freely I give.”