I did some searching for you on the net and come acroos this website.
Try to download this one it seems to be cool thing
TUNER
High accuracy (uses 16 bit / 44100 Hz input!)
You can tune guitars with no signal output (through microphone)
27 different tuning types (standard, lowered, dropped, open tunings, Hawaiian etc.)
Modulation of root frequency
Tuning with midi tones
Nice and simple environment
it's free!
so they say
try it