ChordWizard
[Win] For guitar, banjo, mandolin, bass, ukulele, bouzouki, and others. Also offers free music theory tutorial.

Desktop Banjo
[Win] 5-string banjo learning tool that generates tablature and chords.

Desktop Music
Software for guitar, bass, and banjo players.

Funkyseagull.com
[Win - Mac] CD-ROMs for banjo, fiddle and guitar.

In-Tune Multi-Instrument Tuner
For tuning guitar, bass, banjo, mandolin, violin, viola, and cello. Other instruments via the pitch selector.

ScaleTool
Scale generator for guitar and piano.

The Violin Tutor
Teaches scales, arpeggios, exercises, at different tempos. Theory overview and finger patterns. Windows.

The Virtual Virtuoso
Accompaniment music plays to aid in the practice of scales, etudes, and performance pieces for violin, viola or cello.

Twofold Media
[Win] Description of Violin Magic Made Easy, a CD-Rom for the beginner violinist and support crew.

Virtual Fretboard
Guitar, tenor guitar, bass, and mandolin fretboards showing chords and scales.