This seems to be accessible and relatively easy to get around in.
http://www.usc.edu/schools/college/crcc/engagement/resources/texts/muslim/hadith/ There is access to several major collections, and also to the "qudsi" or words of Allah as reported by Muhammad independently of the Qur'an. These are especially important to Muslims in general--but it all is, really.
So if you wanted to explore the Hadith (ahadith is the plural), it's a good place for English speakers to begin.
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