Flageolet

Chromatic open source guitar tuner. The source code is available on GitHub.
Supported tunings:
- Chromatic (C2 - B5)
- Standard Tuning (EBGDAE)
- Half Step Down (E♭B♭G♭D♭A♭E♭)
- Full Step Down (DAFDGC)
- 1.5 Steps Down (D♭A♭EBG♭D♭)
- Two Steps Down (CGE♭B♭FC)
- Drop D (EBGDAD)
- Drop C#/B♭ (D#A#F#C#G#C#)
- Drop C (DAFCGC)