With the growing popularity of IPTV services, we can find a large number of free IPTV channel addresses on the Internet. There are often hundreds, thousands or even tens of thousands, and a large number of them are invalid. Therefore, after we collect a large number of IPTV links, the first thing to do is to check their availability. If you manually check the availability of the channel list one by one, the workload will be huge, the efficiency will be extremely low, and that is unrealistic.

Solar Master is a solar energy calculator application for Android, developed by Afeef Mohammed from Yemen. It can easily and accurately calculate the needs of solar and power systems, such as the correct angle and orientation of solar panels, the number of solar panels and batteries required, the size of power inverter/UPS, controller and charger, and how to connect the solar panels in series and parallel with the battery according to the voltage of system/inverter.