Weather app

I like: SailFlow

It's limitation is that it only gives results/forecasts for weather-stations.
The really nice thing is that is overlays recent actual wind with the previous forecast so you can see how which of the models seems best "locked on" to the conditions.
I like that I can check weather, wind and tides all from within my Navionics app. Just go to Menu, Weather and Tides

and click on the section you want: sunrise/sunset info in upper left, wind in upper right, tides in the lower left and currents in the lower right: