Oh boy, here we go; *means I still have them
Guitars;
B&M 'Classico', >Egmond Jumbo with an action you could drive a bus under,>Eko Ranger 6 (still have this, damaged)*, >Yamaha FG something or other,>Takamine EN20* >Seagull 12 string* >Crafter S7>Fender USA Strat>Martin D35>Hohner resonator* >Rob Armstrong 6/12 string doubleneck acoustic*>Aria pro2 electric, with coil taps and such*>Warwick bass>Martin travel guitar (POS!)*>Triumph archtop (repair project)*>Rainsong WS1000 carbon fibre acoustic*.
Mandolins etc;
Aria imported POS with pickup (out on loan), Ozark F5 copy (a really good one)*> Stuart Wailing brass-bodied resonator*>David Freshwater strange-bodied thing, only 6 made*>Rigel A+ deluxe Custom*>one of my home made spruce/wild cherry mandolins, having sold the last 8 of them*>Musikalia Octave Mandolin*>Rob Armstrong Mandocello*
Banjos
Ozark POS (on loan)>English no-name zither banjo, 1928 John Grey banjo-uke, 1940's no-name tenor banjo (repair project)*>Gold Tone OB250G Plus, with Keith Tuners*>Gold Tone IT250F short scale Irish tenor
Others; pianos, keyboards, flutes, saxophones, clarinets, whistles, harmonicas, bodhran, couple of fiddles, accordians etc. etc.
Total in the house is around 130. I should add that my spouse and two daughters play more instruments than I do.

That felt cathartic!
Tim from Bit on the Side

Glossary: POS = Piece of something not very nice.