chainer

chainer.py is the module responsible for creating the lexical chains

expansion

expansion.py fetches lexical relations of a noun phrase via

fsautomaton

fsautomaton.py merely provides a data structure containing the finite state automathon

sumit

sumit.py is the main module providing a Unix command line interface for using SumIt.

summarizer

summarizer.py is the module where the actual summarizing takes place.

tagging

tagging.py reads and prepares the input text, processes it

tokenizer

tokenizer.py is the module responsible for processing the tagged input text,