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WeatherMaster, Open Source, and the Future of Android; An Interview with Pranshul
(gardinerbryant.com)
This is a most excellent place for technology news and articles.
My experience was actually with the APIs and not with the main app. They originally allowed free access to the API for individuals, with registration, and a lot of excellent third-party apps let you enter your API to use them. When IBM purchased it, they priced the use of the APIs so that there was no option that made sense for individuals. If you weren't using it in volume, and paying tens of thousands of dollars a year, you were just out of luck.
I hadn't heard that IBM sold it off. I will have to go back and look at the original app. I had thought it also went through a big price jump, but that may have settled out in the meantime. It's been a while now.