rechne.exe is an open source command line calculator which is highly functional and very easy to use. rechne.exe supports a lot of mathematical functions, complex numbers, calculation with big numbers and is well documented.

» provides an easy-to-use interactive shell mode
» can easily be intergrated into shell scripts
» can transfer numbers from any numbering system into any other (e.g.: binary numbers into hex numbers into decimal numbers...)
» can handle complex numbers
» provides over 40 mathematical functions, such as log, sin, cos, ...
» provides detailled manual pages with many examples on how to use rechne.exe or a particular function
» allows for unlimited nesting of terms by the use of brackets
» allows for saving numbers under a name, e.g. for a frequent use
» allows for referencing the last solutions in your current input
» provides a big-number mode for calculation with very large integers (RSA 4096 is no problem)
» provides an independent hardware speed test by executing some expensive calculations and measuring the time
» does not depend on external libraries and for this reason is portable
» provides a static library for easy integration in C/C++ programs
» allows for defining own functions
» factorization of not too large numbers

rechne.exe and its sources are published under the GNU General Public License (version 3). Feel free to use, copy or edit rechne.exe under the terms of this license.
Please note: As stated in GPL rechne.exe comes with absolutely no warranty.
A copy of this license comes with the download archive.