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Jim - An overview of Jim capabilities
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.
Numi App - Numi is a beautiful text calculator for Mac.
errProof - The website has a lot of useful and unique tools.
Soulver 3 for Mac - A smart notepad with a built in calculator