A set of help screens are provided to assist with component value selection, and for determining the optimum frequency and Q of the filters for various applications.
http://www.sound.au.com/mfb-filter.zip
Student/demo version of a highly interactive and easy-to-use lumped-element filter design program.
http://www.qsl.net/wb6bld/software.html
uses SoundBlaster(R)-compatible soundcard to evaluate 1/3 up to 1/24 octave spectra. Supports full calibration of mixer (result independant of mic/line input and input gain) and allows soundcard frequency response compensation.
http://www.wssh.net/~wattsup/audio/sb_oct_e.zip