Estrella's Test of Tonal Ability, from
Teoria Musical - Music Theory

Sheet Music Online
offers many listening drills (here's an example)
for PC and Mac platforms in a PDF (requires Adobe Acrobat Reader) format,
which are free to all music educators. They also offer many files of public
domain music, ready to use.
Dr. Gilbert Trythall has developed a
number of packages for KBA Software of Morgantown, WV (above), concerning
ear-training and music theory. You may download demo versions of this software
for Windows 95 at this site.
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Earmaster and Earmaster School are Windows and NT programs, respectively,
effective for student needs from beginners to advanced. You are invited
to evaluate these programs at this site.

It may be worthwhile to check out some of the techniques used by our
friends in the commercial music world. Martin Grusin has developed a successful
training program aimed primarily at students of popular voice. This site
demonstrates some of these tricks of the trade and offers some insight into
how less academically trained singers approach problems which are, after
all, universal to musicians, regardless of style.
Click for some examples of Grusin's methods.
The Shareware Music Machine is a huge music software site provided by
the Hit Squad. Check out the myriad of titles available for free, free trial,
or for just a few bucks.