It's all connected to the WMO. Just pick an ANSP / NAA which has an online portal.
Avinor deserves mention, indulge yourself:
https://www.ippc.no/ippc/index.jsp.
If it needs to say 'legally approved', the Swiss are happy to fill your boots:
https://www.meteoswiss.admin.ch/serv...n-weather.html, links here:
https://www.skybriefing.com/ https://www.flugwetter.de/