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SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
Tipping - Ridiculously quick tip calculator
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Calcbot for Apple Watch - Calculate, convert, and split tips from your wrist
NumWorks - The graphing calculator that makes learning math easier.
Toothpick - Calculate your tip based on the server's gender