NGTuner

Using a proprietary algorithm developed by myself and perfected for years, this very simple tool will help you tune your acoustic guitar to standard EADGBE, or "standard E" tuning. It displays a frequency analysis, a fine tuning needle, and a guitar neck showing exactly what you are doing. It even points out which tuning lug you would use to make adjustments for each string as you pluck. All you need is a PC and a mic (even your built-in mic will do) and you're all set!

Limitations:

Nag screen