Free
UConvert
Efficient Conversion Tool for Windows Users
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A free and lightweight unit conversion tool
Curly Lion: A Free Windows Calculator Tool
Software adding machine, tape, Excel export, correction possibilities
Gorgeous, skinable desktop calculator
Provides the estimated birthing date for a large list of animals
Get accurate stats on employee work time
Calculate and convert in currencies from all over the world
Calculator to process non-trivial arithmetic expressions
Efficient Calculator Software for Windows Users
Perform sums with this talking calculator
Create virtual serial ports directly from your application
Free alternative to Microsoft Office
Trial version of a basic converter
A free and useful PDF converter for Windows
Scientific Calculator: Mathematics at your fingertips
Free and Open Source Alternative to Macsyma or Maple