I use overdrop. I don’t think it’s open source tho.

Breezy weather is a fork of geometric weather available on Izzy repo

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Geometric Weather is a pretty nice FOSS one. I’ve switched to Weather Today for its design though.

I use Shadow Weather, but I don’t think it’s open source. It’s really great though, has everything including real-time lightning map.

Geometric Weather is great for eye candy and being able to write your own format of data to show on the widget. Sunrise, Sun down, Moon Rise, weather alerts, etc.

But I also need a local radar for rain, so Quickweather is an alright app on its own but it shines with the quickness of its radar screen.