Gnome calculator
SpeedCrunch
Qalculate!
Soulver
Numi App
OpalCalc
Event Viewer
WolframAlpha
Jim
errProof
Getcalc
Insect
RANDOM.ORG
Random-Required
NumWorks
PCalc
Gnome calculator JimSpeedCrunch - 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 .
errProof - The website has a lot of useful and unique tools.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Getcalc - getcalc.com - online calculators, formulas & work with steps (step by step calculation) for expressions, statistics, probability, finance, health, geometry, general purpose & engineering calculations along with basic & scientific calculators.
Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.
Insect - High precision scientific calculator with full support for physical units.