A Solar Monitor useful online tool, we also use it every day for sunspot data catalogue to identify sunspot regions (vid. NOAA number).
Furthermore on this site can find tools to various digital image observations of the satellite's instruments which are available, and predictions for the actual solar activity
(vid. Solar Flare Forecasting), in maintaining of
TCD and e-INIS in Ireland.
Other Space Weather sites: Solar Influences Data Analysis Center (SIDC) - Belgium and Space Weather Prediction Center (SWPC) of National Oceanic and Atmospheric Administration (NOAA) - USA.
The Helioviewer is a visualization tool, web application to handle observation-images which are made of the sun.
There is Desktop software version - JHelioviewer - available for download for Linux, Windows and also OSX operation systems.
Related sites: JHelioviewer software and JHelioviewer: A new way of looking at the Sun - SOHO page.