1. OpalCalc is a brand new type of calculator for the PC.

  2. High precision scientific calculator with full support for physical units.

  3. WebMath is a math site that creates answers to particular math inquiries and issues, as entered by a client, at a precise minute.

  4. Homework Help & Solver

  5. A beautiful, innovative, and modern online graphing calculator.

  6. Mathematica is a technical computing system with a broad range of uses throughout various fields of discipline.

  7. SpeQ is a small, extensive mathematics program with a simple, intuitive interface.

  8. Do maths like a normal person.

  9. PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody...

  10. Simple yet very effective calculator with print capabilities and log registration.

  11. Calcbot is a simple and beautifully designed calculator for your iPhone, iPod touch and iPad.

  12. galculator is an open source scientific calculator with a modern GUI and a wide range of operation modes. It supports algebraic, reverse polish (RPN) and paper mode notations.