Stringed

See also:

Absolute Fretboard Trainer - Play-along course for mastering the fretboard of guitar, bass, mandolin.
ChordWizard - [Win] For guitar, banjo, mandolin, bass, ukulele, bouzouki, and others. Also offers free music theory tutorial.
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.
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.
The Virtual Virtuoso - Accompaniment music plays to aid in the practice of scales, etudes, and performance pieces for violin, viola or cello.