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

SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .

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

Precise Calculator - Free programmable scientific calculator for Windows; solve math problems, algebra, statistics examples and tutorial

NumWorks - The graphing calculator that makes learning math easier.

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