Matt, there are plenty of guitar tuning websites that output pitch. Here's an online chromatic tuner:

http://www.onlinetunermetronome.com/preset/chromatic-tuner.html

Also, pocket tuners are so cheap these days, and many of them output tones as well.

Finally, there are downloadable chromatic tuners that run standalone. Perhaps when you searched you used 'pitch pipe' instead of 'chromatic tuner'? Use 'chromatic tuner PC' and you will find many potential programs to use.

-Scott