I can think of 31 offhand that I own & shoot regularly. I shoot daily using Colibri and Super Colibri .22 cartridges in my home range. And outdoors, spending only $13-$16 for 500-550 rounds in a plinking session (not annually) sure beats spending $100+ on a session with my other guns. I love .22's! And yes, I like oddball goofy pocket pistols, so if you are squeamish about ZAMAK, don't read the list. I'm sure I've forgotten some here:
Handguns:
Armes Unique - Corsair D6 - 1957 semi-auto, 6" barrel
Astra - 2000 Cub - 1956 - .22 Short semi-auto
Beretta - 21A BobCat - semi-auto
Browning - BuckMark Micro-Bull, semi-auto, 4" barrel
J.C. Higgens - Model 88 - 1957 revolver (High Standard Sentinel)
Ruger - Mark I - 1977 - 6" barrel, semi-auto
Taurus - PT-22 - Matte Black, semi-auto
Intratec - Tec-22 - semi-auto, 30-round magazine
Heritage Arms - Rough Rider - Revolver - 6.5" barrel
Iver Johnson - TP-22 - semi-auto
North American Arms - Mini-Revolver - 1 1/8" barrel
Phoenix Arms - HP-22 - Satin, semi-auto
Jennings - J-22 - early model, Black, semi-auto
Bryco-Jennings - J-22 - Chrome, semi-auto
Bryco-Jennings - J-22 - Black, semi-auto
Davis Industries - D-22 - Chrome, 2-shot derringer
Lorcin - L-22 (L22BB) - Black, semi-auto
Rohm Ghmb - RG10 - Revolver - .22 Short
Rohm Ghmb - RG14 - Revolver - .22LR
Sedco Industries - SP-22 - 1988 - Chrome, semi-auto
rifles:
Mossberg - Model 42M(b) (1946) - bolt action, 23" barrel
Mossberg - Model 46M(b) (1947) - bolt action, 23" barrel
Mossberg - Model 146B (1950) - bolt action, 26" barrel
Ruger - 10/22RB - semi-auto, 18.5" barrel
Marlin Firearms - 781 - bolt action, 20" barrel
Savage/Stevens 74 Little Favorite - 22" barrel
Henry Firearms - H004 GoldenBoy - lever action, 20" barrel
Henry Firearms - H001 - lever action, 18" barrel
Henry Firearms - H002B Survival - semi-auto, 16" barrel
Armscor - MAK-22 - semi-auto, AK47-ish styling
Ted Williams (Ithaca M49) - 16" barrel