pylize is a Python-clone of:

PLies <http://www.rot13.org/~dpavlin/presentations/XLSies_to_PLies/> (sic!)
by Dobrica Pavlinusic

which is in turn inspired by:

XSLies <http://lempinen.net/sami/xslies/>
by Sami Lempinen

and:

W3C SlideMaker <http://www.w3.org/Talks/slidemaker/YYMMsub/>
by Stephan Montigaud, Pierre Fillault and Masayasu Ishikawa