An online museum documenting the history, mechanisms, and technical workings of mechanical and early electronic calculating machines. The collection, assembled over 50 years, features machines organized by technology type and manufacturer, with photographs, technical specifications, and detailed descriptions of internal mechanisms produced through hands-on disassembly and study. Established as a public website in 2002, the museum also incorporates collections assembled by engineer John Blackler and the late Professor Alan Bromley of the University of Sydney.

Cray History project documenting the history of Cray Research and its supercomputers, with a collection of materials starting from the Cray-1.

American Computer and Robotics Museum in Bozeman, Montana - one of the oldest continuously operating computer museums in the world, with exhibits spanning 4,000 years of information technology.

LEO Computers Society, preserving the history of the LEO (Lyons Electronic Office), the world's first business computer, developed in 1951 by J. Lyons & Co.

Commodore.ca - comprehensive resource documenting the history of Commodore Business Machines, including the PET, VIC-20, C64, and Amiga computer lines.

Obsolete Computer Museum featuring a curated list of vintage and discontinued computers with photographs and basic specifications.

Vintage-Computer.com, a community resource listing and cataloging vintage computers, terminals, and peripherals from various manufacturers.

Vintage calculator reference site with information about collectible calculators, including HP, TI, and other manufacturers.

Nathan Zeldes's History of Computing reference site with curated links and information about key developments in computing history.

Calcolatoria - Nicola Marras's collection documenting the history of calculating instruments from ancient times through mechanical and electronic calculators.