https://thingspeak.com/channels/547822

https://www.wunderground.com/weather/fr/saint-merri/48.86%2C2.35

https://widget.coinlib.io/widget?type=chart&theme=light&coin_id=859&pref_coin_id=1505

https://wow.metoffice.gov.uk/observations/details/20190715t4jxi4p8bye6ucrdyyb96spo5r

https://weathermap.netatmo.com//?zoom=15&type=temp&param=Filter&stationid=70%3Aee%3A50%3A19%3Adc%3A40&maplayer=Map

https://demo.home-assistant.io/#/lovelace/0

Большой список источников публичных данных:

https://github.com/awesomedata/awesome-public-datasets