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 .

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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.

NumPad - A web-based text editor with a powerful built-in calculator

Numbr - An elegant calculator for the web

SEO Buddy - SEO Buddy is an SEO productivity tool packed with everything you need to grow your search traffic, outsmart your competitors and take control of your entire SEO strategy.