G-Tuner (free)
Mark Brinton / Video
Downloads: 100k
Description
Chromatic guitar tuner using microphone input.
The input frequency is shown, along with the closest note.
Notes are shown for the standard guitar tuning, and the colour (green/red) indicates how close you are to the correct note.
See website for more information.
22 Dec 09, v1.2 - keep screen active, minor GUI change