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EBTCalc - Programmable Reverse Polish Notation (RPN) calculator that lets you create custom buttons.
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FreeCommander - FreeCommander is an easy-to-use alternative to the standard windows file manager. The program helps you with daily work in Windows. Here you can find all the necessary functions to manage your data stock.
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Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.