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Get the Best Weather in a desktop widget with the AccuWeather Stratus.

Customize the look of your Mac and get weather forecasts.

Great FREE weather app with the following features: + hourly forecast for the next 24 hours, + daily forecast for the next 5 days.

Mach Weather is a free weather application for your Mac.

WeatherDock is a nice weather application for the Mac.

WeatherBug Lite helps you keep track of weather reports on your Mac.

Windows

Windows Mac

ASHRAE

ASHRAE Duct Fitting Database

Free

Contains data on multiple types and models of fittings