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Calculist - The open-source, web-based thinking tool that facilitates effective thinking for solving problems.
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.
Numi App - Numi is a beautiful text calculator for Mac.
Calca - Calca is an advanced symbolic calculator for iOS, OS X, and Windows that's as easy to use as a text editor.
Carbide - A new kind of programming environment
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