Our adaptation of these techniques for detecting literary text reuse is available as open source software releases of two related systems: PAIR (Pairwise Alignment for Intertextual Relations), a one-to-many comparison system that allows the user to submit a document or part of a document to be aligned against a pre-indexed corpus; and PhiloLine (PhiloLogic Alignment), a batch mode many-to-many aligner that compares all documents or document parts to all other documents or parts in the same database or between two collections. PhiloLine generates output either as static alignment reports or as structured data for subsequent search and analysis and is lightly dependent on PhiloLogic, our primary text analysis system. While functionally similar, the two systems are quite distinct in implementation, given the significant differences in processing requirements between the interactive and batch mode methods. When discussing the sequence alignment approach in general, we shall refer to PAIR.