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Messier45 (Popularity: )
http://Messier45.com/
News, observing guide, references, download, deep sky maplet, list generator, other tools, and help guide.
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Messier Marathon (Popularity: )
http://www.messiermarathon.com
Includes instructions, biography, dates, timeline, posters, NASA tv, and links and information.
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Deep-Sky Org (Popularity: )
http://www.deep-sky.org/
Features a reference of Messier objects, telescope information, images, and deep-sky links.
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Visual Deep Sky Observing (Popularity: )
http://www.andreas-domenico.de
Galleries of sketches, legend, projects, publications, and links.
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