speaker designing software for Windows 9x/NT environment. You can design Closed, Vented and Bandpass boxes with this program. It also allows you to calculate few different types of filters.
http://www.wssh.net/~wattsup/audio/winisdbeta.exe
Series & parallel, Compound & Isobaric Designs. Sealed, Vented, & Passive Radiator systems. Graphs include group delay, transient response, magnitude, Max SPL, Driver/Passive Rad excursion & Impedance. Box dimension calculator. Single/Multi Port vent calc
http://www.wssh.net/~wattsup/audio/boxdem40.zip
tube audio design software
http://www.glass-ware.com/
produces three-dimensional graphs that illustrate room resonances, early reflections and later reflection diffusion.
http://www.wssh.net/~wattsup/audio/ETFDemo.exe
for doing quick and dirty crossover calculations.
http://margo.student.utwente.nl/el/audio/tcd15.zip
A program to design speaker boxes for cars dual order bandpass. Isobaric and push and pull boxes.
http://www.wssh.net/~wattsup/audio/bandbox.zip
automatically calculates axial, tangential, and oblique modes for a rectangular room
http://s2n.org/download.html
guide you through the basics of room acoustics and and surface calculator.
http://www.sysdevgrp.com/