I am in need of a free tone generator (enter a frequency to output) for Mac OS X that can be "dialed" in real time. I need to be able to adjust a slider without having to stop/start/type in a new value. I have not been able to find a single application that can do this.
Here's a tone generator / tuner application that I wrote, available for free online:
It was originally to help people with tinnitus find the frequency their ears are ringing at, but it certainly has other uses.