CCDciel is free software released under the terms of the
GNU General Public License
This tool show the status of the safety monitor, when the light is green it is safe to open the observatory for observing, for example it not rain.
This is related but independent of the Weather station. Some sensors of the safety monitor can be related to the weather but not only. You can also be interested to monitor the UPS status to be sure you have enough battery to close the dome in case of power outage.