InterRAD - A system by Freese-Notis Weather http://www.Weather.Net/fn/newhoo.radar.html
InterRAD is both browser and special software accessed system available with NEXRAD images generated by some of the fastest systems ever. Radar pictures can be fully panned and zoomed-in upon with the InterRAD software. Free-trial access is available by request.
MeteOS http://www.angelfire.com/sc/stormlab/index.html
MeteOS is an application for forecasting weather. It can be used in the operational work of airports, meteorological stations, storm chasers, and weather enthusiasts.
Skywatch Weather Software http://www.skywatch.org/
Skywatch has a variety of weather software items specifically suited for Skywarn members to avid weather watching enthusiasts. Emergency managers to storm spotters will find resources here.