- (AU) Australian Casio Education Site (A.C.E.S.)
 - Teacher activities and support for Casio hand-held technology. - Aaron Adding Machines
- Retro-futuristic calculators made from wood, brass, and old fashioned LEDs.
- Casio (6)
- Comptometer: Biography of a Machine
- Offers a history of the Comptometer, the first practical calculating machine invted by Dorr Eugene Felt in the late 1880s.
- Computissimo
- Photo collection of micro-computers, video games, microprocessors, mechanical and electronic calculators, and more.
- Hewlett-Packard (7)
- Museum of Pocket Calculating Devices
- Includes a massive photo gallery of calculators throughout the ages of all different shapes and sizes.
- Museum of Soviet Calculators
- Visual museum of early electronic Soviet calculators.
- Old Calculators Web Museum, The
- Devoted to documenting the technology of desktop automatic calculating machines -- from the 1950's and '60's, through the pocket wonders of today, and on into the beginnings of the desktop computer of the mid-1970's and early '80s.
- Soviet Calculators Collection
- Provides pictures and brief descriptions.
- Texas Instruments (17)
- Vintage Calculators
- Highlights the evolution from mechanical to hand-held electronic calculators.
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