Looking around as I type...

Violin (German / 1929)
Violin (Amatuer made, Didsbury. MCR / 1930)
5-string 'Pie Crust' violin (aka 'Accursed Viol' / Chinese made)
NS electric violin
Korg Kaossilator
Kaossilator Pro
Diverse cheapo Behinger stomp boxes (flangers, delays etc.)
Boss looper
SM57
Electronic shruti box
Indian pocket trumpet
Karadeniz Kemence (Turkey)
Welsh pattern medieval Crwth by Tim Hobrough
Breton pattern Crowd by Tim Hobrough
Hummel (Swedish folk instrument 1880)
Citera (Hungarian folk art treen circa 1850)
Citera (Hungarian 1980)
Vielle (Medieval fiddle / Chinese made)
Vielle (Medieval fiddle / John Savage, UK)
Tupian Chalumeau in C
C Clarinet (simple, 1920)
Bb Clarinet (simple, 1920)
10 tuned Doromb (Jew's Harps) by Zolton Szilagyi
Diverse Double drone whistles & Folk flutes from Yugoslavia, Slovakia etc.
Innumerable Jew's Harps from all corners of the human world (Dan Moi, Khomus, Scacciapensieri, Murchanga etc. etc.)
Low D whistle by Iain Wood
Various cheapo whistles & recorders (Generation, Clarks, Faedog, Aulos, Dolmetsch etc.)
Hohner button Melodica Alto
Self-made end & cross blown bamboo flutes
Overtone & harmonic flutes
Diverse Hunting horns
Indian harmonium (domestic)
Indian harmonium (portable / laptop style)
Various Chinese Gongs
Various Singing Bowls
Various African thumb-pianos
Burmese Kyeezee
4 dumbeks (various sizes)
Remo Fibreskyn Frame drum
Bendir
Bodhran (played as frame drum with snares)
Diverse Bells (Animal bells, wooden bells, ankle bells, Chamonix bells, Noah bells, Camel bells, Tiger bells...)
Diverse Fowler & hunter calls
Diverse Bird warblers
Stylophone
Chinese Er-Hu
Antique Tenor horn
Monovalve bugle
Troll Pipe (home-made one-man band flute / bowed drone & bell combination - click for sound sample)

Time for a clear out I think...