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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 .
Jim - An overview of Jim capabilities
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Insect - High precision scientific calculator with full support for physical units.
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.
errProof - The website has a lot of useful and unique tools.