Links to free accessible satellite data and images from CIMSS (Cooperative Institute for Meteorological Satellite) and Dundee Satellite Receiving Station.
CIMSS Satellite Data
The Cooperative Institute for Meteorological Satellite Studies (CIMSS) a cooperation between the University of Wisconsin-Madison (UW-Madison), the National Oceanic and Atmospheric Administration (NOAA), and the National Aeronautics and Space Administration (NASA), since 1980. The CIMSS publishes numerous products like Infrared Satellite Image with Color Background.
The following graphic shows all available regions (Date: 2014-12-01 00):
Dundee Satellite Images
Dundee Satellite Receiving Station from Dundee University (UK) maintains an up-to-date archive from geostationary satellites covering the whole earth as well as images from NOAA, SeaStar, Terra and Aqua polar orbiting satellites. This satellite data is free accessible for registered users.
The image below shows all available geostationary satellite and their coverage of the earth: