This article is from the Acoustics FAQ, by Andrew Silverman with numerous contributions by others.
A range of programs available for downloading from the Simtel archive.
Spectrogram 3.2 - Accurate realtime Win95 spectrum analysis program (freeware) by Richard Horne is at a few sites including: http://tinker.winsite.com/info/pc/win95/sounds/gram32.zip
The comp.speech faq has several links to speech related software including speech recognition and text to speech programs.
There are a few programs for various platforms listed at URL http://www.cisab.indiana.edu/CSASAB/index.html The programs listed are mainly for sound analysis and editing.
Some software is available for audio systems design at URL ftp://ftp.uu.net/usenet/rec.audio.high-end/Software
Odeon is a program for architectural acoustics. A demonstration version is available by ftp. The demo includes a large database for coefficients of absorption. A web page at URL http://www.dat.dtu.dk/~odeon/index.html describes the capabilities of the program and gives the ftp address.
Also some interactive acoustics software (eg room acoustics, RT, decibel conversion etc) is available at a couple of sites.
 
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