Free Software for Musicians and Luthiers

Don't Throw Your Money Away

Audacity

Great for sound recording and editing. Runs on most operating systems.

ABC Navigator

Converts ABC notation to standard notation, plays files as midi, etc. Windows.

Open Metronome

My favorite metronome. Windows.

Fretcalc

Calculates fret spacing for any scale length offering many options. Windows and other systems.

Shrinkulator

Calculates wood movement based on species, temperature and humidity. On-line.