This is just an experiment in putting supernova spectra on the web in ASCII form. All the spectra I've collected over the years are here, except for all those that I've lost: e.g., all the SN 1987A polarization spectra. The formats are a hodge podge and the header information is of various quality---caveat downloader. The spectra are found below under the time period of the supernova of interest. The particular supernova directories have no index.html files, but there is sometimes a paper.html file that you can click on to get references for that supernova.
Below the spectra are old template light curves that are still of use in analyzing new light curves.