Embertone's Canjo is a free instrument for Kontakt FULL (not the player) 4.2.4+. It is a buzzy, twangy, single-stringed instrument with a lot of personality.
The main instrument includes three articulations: fingered, picked, and muted. There are also lots of round robins and dynamic layers, which makes the instrument feel very natural.
What exactly is a Canjo? This might help (from Henry Hoover's dedicated Canjo website):
A Canjo is a single string musical instrument. It is held like a guitar but may also be played on a table or lap. The neck is made of furniture grade kiln dried hard wood hand rubbed with boiled linen seed oil. On the neck fretted diatonically (like a dulcimer including a 6-1/2 fret) are twelve notes or finger positions.
The instrument includes an arpeggiator that will infuse an awesome rhythm into your music.