Marko is a simple toolset that allows you to create markov chain databases of a corpus (or two) of text and then allows you to compare unknown texts to these databases. For any two marko databases you can calculate the probability that the unknown body is related to one over the other. Possible applications include intelligent mail filtering, plagiarism detection, and historical research.
nmzmail is a tool to use the namzu2 search engine from within the Mutt email reader to search email stored in maildir folders. Based on the result of the namazu query, nmzmail generates a maildir folder containing symbolic links to the messages matching the query. A simple Mutt macro makes it easy to use from within Mutt.