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

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

Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.

Calculator++ - Calculator++ is an advanced, modern and easy to use scientific calculator.

NumWorks - The graphing calculator that makes learning math easier.

CalcTape - CalcTape is a revolutionary new kind of pocket calculator.