PAIR (Pairwise Alignment for Intertextual Relations) is a free, open source sequence alignment algorithm for humanities text analysis. It identifies similar passages in a large corpus. Corpuses are indexed for future use, and incoming texts can be compared against the entire corpus.
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PAIR also appears in Project Bamboo's DiRT, a registry of digital tools suitable for academic research. DiRT contains a wide range of tools and software searchable by task, such as annotation, content management, collaborative research, or authoring. It is an excellent resource for Digital Humanists seeking the right tool for the task at hand.
View PAIR in DiRT:
http://dirt.projectbamboo.org/resources/pair-pairwise-alignment-intertextual-relations
View the full site:
http://dirt.projectbamboo.org/