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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
Numi App - Numi is a beautiful text calculator for Mac.
Insect - High precision scientific calculator with full support for physical units.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
errProof - The website has a lot of useful and unique tools.