- Calculating Machines
- Features the site on collections of different types of calculators with historical facts and images.
- The Calculator Reference
- Deals with buying and selling calculators and other electronic devices with references and news updates.
- Calculators
- Collects various models and types of calculators made from the 60's, 70's, or 80's.
- Curta Calculating Machines
- Includes details and photos on the device with links on other related pages.
- The Famous Slide Rule
- Promotes the site with collections of slide rules, Castell Addiator, and Rapid-Calcolo with brief descriptions and image thumbnails.
- HP Collection
- Focuses on featuring and documenting accessories of calculators with latest news.
- Museum of HP Calculators
- Online museum dedicated to historical Hewlett-Packard calculators from 1968 to present. Site offers photos and technical details on all entries.
- Museum of Pocket Calculating Devices
- Gives information on various image thumbnails of calculators with historical facts.
- Museum of Soviet Calculators
- Collects hand-held computing devices such as slide rules and electronic calculators with pictures and history data.
- Rechenmaschinen-Illustrated
- Provides information, references, and updated pictures of calculating machines.
- Soviet Calculators Collection
- Endorses collection of calculators with article information and image thumbnails.
- Texas Instruments 59
- Highlights the programmable gadget with its history, gallery pictures, featured programs, and latest updates on the site.
- Vintage Calculators Web Museum
- Information on the evolution of calculators with historical background, pictures, and news updates.
- Vintage Electronics Collections
- Contains site with news updates, background history, and information on electronic devices.
- Vintage Programmable Calculators
- Presents various pictures and brief details of calculators with its programs and related links.
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