Internet of Things, in the context of medicine, is not just about activity trackers, sports watches, scales or blood pressure monitors with Bluetooth connection. It has the potential to revolutionize medicine, even though at present there are currently hardly any applications in the commercial sector. However, there are several open source IoT projects in operation that truly showcase the potential of IoT in medicine. Let's take diabetes for instance. I, personally support such projects as an active user being a diabetic myself. In this article, I would like to present some of these highly interesting IoT projects, which simplify the treatment of diabetes Type 1 and offer possibilities of completely new and promising therapies.