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.net is a hobbyist-run archive documenting the history of Cray Research supercomputers, from the Cray-1 through the T3E and beyond, including machine family specifications, photos, documents, and a timeline. It features contributed personal recollections from Cray engineers and staff, scans of Cray Channels magazine and Cray Chips newsletters, technical manuals, and listings of known historical Cray systems and their locations. The site invites visitor contributions of photos, documents, and stories to expand the archive.

Email History resource tracing the evolution of electronic messaging from 1800s telegraph systems through the development of ARPANET-era electronic mail.

HPCC is a voluntary, independent user group for enthusiasts of handheld and portable computers and calculators, particularly Hewlett Packard models, run entirely by and for its members without commercial support. It holds in-person and online meetings, publishes the club journal Datafile, hosts conferences, and maintains an online library of articles, schematics, ROM/MOD files, and calculator documentation. The club also produces books such as RCL20 and RCL40 chronicling HP calculator history.

A personal website by Sergei Frolov cataloguing an extensive private collection of Soviet-era computing and electronics devices, including mechanical and electronic calculators, home computers, and digital wristwatches. The site organizes items into categories such as mechanical calculators, PDP-11-family and Z80-family computers, and electronic clocks, with each item linked to its own page. It functions as a virtual museum documenting Soviet and Russian digital electronics hardware.

Calculators.de - German-language online museum dedicated to the history of calculators and calculating machines with photos and technical details.

Calculator.org is a hobbyist website offering free downloadable and browser-based calculator software (Calc98) along with a database of current and past pocket calculator models, unit conversion tools, and articles on calculator history and design.

Oughtred Society, an international organization dedicated to the preservation and history of slide rules and other historical calculating instruments.

Videocard Virtual Museum is a personal collection website cataloguing video graphics adapters (GPUs) from many vendors, searchable by chip vendor, card maker, bus type, platform, and year, with photos and specifications. It is run by an individual enthusiast rather than an institution, and includes user comments and periodic updates of newly added cards.

The Old Calculator Web Museum is a personal project curated by Rick Bensene, showcasing his private physical collection of vintage desktop and early portable electronic calculators from the 1960s and early 1970s, along with some early computers. The site offers exhibit pages with photos and specifications, a calculator advertising and documentation archive, articles on calculator history and technology, and links to related sites. It is self-funded and maintained by a single enthusiast without institutional affiliation.