TLA Systems

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PCalc
Trial version
Perform various scientific calculations.
Mac
DragThing
Trial version
Alternative dock application.
Mac
PCalc Lite - The Best Calculator
Free
PCalc Lite: A Feature-Rich Calculator for iPhone
iOS
PCalc - The Best Calculator
Paid
PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody looking for a feature rich calculator.
iOS