I'm the author of AKWeather plugin for HomeSeer Automation and really like to add Windy.com to the list of supported providers (currently 44). But the pricing 990€ / year is far beyond automation users will be willing to pay.
Just wondering if you can add some "personal" plan for $5-$10 p/m for single user? You can have some limitations, i.e. max call rate 30 minutes, etc