General Interest
NOAA Space Weather Prediction Center (SWPC, formerly the Space Environment Center)
Official NOAA SEC Operational SOLAR2000/E10.7 Nowcast
JPL Ionospheric and Atmostpheric Remote Sensing Group
Current Space Weather
Windows to the World (UCAR Space Weather)
Data Archives
NOAA Space Weather Prediciton Center
NASA - Goddard Solar Data Analysis Center
International Solar-Terrestrial Physics
Software
ITT - IDL (Formerly RSI)
Rockets and Satellites of Interest