FMIT is a graphical utility for tuning your musical instruments, with error and volume history and advanced features.
Features:
- Estimation of the fundamental frequency (f0) of an audio signal, in real-time.
(the f0, not the perceived pitch) - Harmonics’ amplitude
- Waveform’s period
- Discrete Fourier Transform (DFT)
- Microtonal tuning (supports scala file format)
- Statistics
- All views are optional so that the interface can be as simple as possible.
(make it easy to see on a distant screen) - Can support OSS, ALSA, PortAudio and Jack sound systems.
- Everything runs under Linux
, Mac OSX 
and Windows 
The Audio File 
I’ve been looking for a tuner that actually shows the frequency history instead of just a needle jumping around. The fact that it’s open-source is a huge plus, too.
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