This is a simple tool to create CSV files from RRD archives.
Note that it requires that rrdtool be in your path, and that you have the XML::SAX module installed, as well as Text::CSV_XS (preferred) or Text::CSV_PP.
./rrd2csv <rrd_file> [output_file]
If the output file is not specified, it will write to the console.
If you give the output file the extension
.xls you will be able to automatically import it into Excel.