SIMATIC WinCC is described as 'Supervisory control and data acquisition (SCADA) and human-machine interface (HMI) system from Siemens. SCADA systems are used to monitor and control physical processes involved in industry and infrastructure on a large scale and over long distances' and is an app. There are 2 alternatives to SIMATIC WinCC for a variety of platforms, including Mac, Windows, Linux, Web-based and Flathub apps. The best SIMATIC WinCC alternative is DataPortia. It's not free, so if you're looking for a free alternative, you could try Constellation DAQ.