Aviation Weather lets you choose any airport weather stations from its built-in database by either name or ICAO (4-letter) code. Data will be shown in its original format or translated into easy understandable texts.
Meteorologist is a free weather program which allows users total control over their weather viewing, including simultaneous interlaced weather reports from multiple weather locations, weather alerts, and much more.
Radar In Motion
Radar In Motion is a widget for animated weather maps for Dashboard and Yahoo! widgets.
(commercial) Seasonality provides weather forecasts, radar images, sunrise/sunset times, and much more. View informative icons demonstrating what weather is coming your way over the next 7 days. Use radar images to check out where it is raining or snowing.
Weather Underground Weather Widget
Receive weather conditions, animated radar, forecasts, severe weather alerts, web cams and Wunderphotos for any location in the world.
WeatherDock displays weather information.
WeatherSnitch is an application that
displays weather information in your menubar.
Windbuoy is a simple, customizable dashboard widget that retrieves and displays wind speed, direction and gust as well as air temp as reported by any one of hundreds of NOAA buoys. Speeds can be reported as m/s, knots or mph; temp as celcius or fahrenheit.