Matematik
- TI-84 Plus
- TI-84 Plus Silver Edition
- Physical Constants
- https://www.nist.gov/ US National Institute of Standards and Technology
- Mathproblems.Info
- Mathematics Problems and Warm-ups
- The University of Mississippi Math Contest
- The Contest Center
- Nick's Mathematical Miscellany
- Project Euler
- Calculator Know-How
- MathBits.com TI-84 / Nspire
- TICalc.Org
- The Calculator Home Page
- Casio Prizm FX-CG10 Calculator
- Cemetech Calculator Site about programming
- HP Calculators, site with software for HP calculators.
- Handheld and Portable Computer Club, HP Calculators
- The Museum of HP Calculators
- FTP server with HP Prime software
- DM SwissMicros Calculators
- SwissMicros DM42 Manual
- ThomasOkken, Free42, a HP-42S calculator simulator
- HP-35S Programming Examples / Wollindina Media
- Calculator HP-15C Simulator
- John E. Patterson DM15 Information
- The Calculator Store (HP)
- Eddies Math and Calculator Blog
- HP Prime Wiki
- HP Home View, HP-39GS and -40GS
- Larsen Net, lærebøger i matematik og statistik.
- HP Graphing Calculators Wiki
- The WP-43S on SourceForge, discussed on SwissMicros Forum
- The WP-34S on SourceForge, discussed on SwissMicros Forum
- HP-41CX on SourceForge
- User-Code Utility for HP-41 Calculator (hp41uc)
- Systemyde 41CL
- HP-41 Programmable Calculator
- HP-Collection shows vintage Hewlett Packard calculators and their accessories
- HP41 page of Christoph Giesselink
- Brilliant.Org, Learn to Think