Dulcimer...
A wooden box with 2 oval shaped holes on the top, 2 golden metal strips in holes and 1golden strip on either side that both have pins. The strings are attached to the pins and fed through the holes. This instrument is played with sticks.
Hurdy Gurdy...
It has a guitar shape base. It works by turning a crank that was attached to a wheel which the strings rubbed against and that's how the sound was made.
Fiddle...
There was many types of medieval fiddles. They were all played with a bow or the strings were plucked with your fingers. To play it, you held it under your chin with one hand holding its neck and the other plucking or guiding the bow - much like how you play a violin. It was easily portable - making it a popular street instrument.
Psaltery...
This instrument is a bit of a cross between a harp and a guitar. You play it using a bow - same way you play a violin. It is a diamond shape and has pins and strings, just like a dulcimer.
Harp...
About 30 inches (76.2 cm) in height, and length. The harp was a highly-loved instrument of the troubadours (composers + performers) and minstrels (medieval singer/musician). Played by running your fingers over the differently tuned strings of the harp.
Rebec...
An earlier version of the violin. Played with a bow and has a hole in the middle.
Viol...
Played with a bow and to play it you'd hold it between your thighs or under your chin. Pretty much a giant violin or an older version of the modern day cello.