Qalculate!

Qalculate! is an arbitrary precision cross-platform software calculator. It supports complex mathematical operations and concepts such as derivation, integration, data plotting, and unit conversion. It is a free and open-source software released under GPL v2.

Features
Qalculate! supports common mathematical functions and operations, multiple bases, autocompletion, complex numbers, infinite numbers, arrays and matrices, variables, mathematical and physical constants, user-defined functions, symbolic derivation and integration, solving of equations involving unknowns, uncertainty propagation using interval arithmetic, plotting using Gnuplot, unit and currency conversion and dimensional analysis, and provides a periodic table of elements, as well as several functions for computer science, such as character encoding and bitwise operations.

It provides four interfaces: Two GUIs, one using GTK and another using Qt, a library for use in other programs , and a CLI program for use in a terminal.


 * Qalculate! (GTK+ GUI): qalculate-gtk
 * Qalculate! (Qt GUI): qalculate-qt
 * Qalculate! (CLI): qalc (usually provided by the libqalculate package)
 * Qalculate! (Library): libqalculate



Use in academic research

 * Bartel, Alexandre. "DOS Software Security: Is there Anyone Left to Patch a 25-year old Vulnerability?."
 * "In our example of Figure 7, we choose to execute /usr/bin/qalculate-gtk, a calculator. Since the stack of the DOSBox process is non-executable, we cannot directly inject our shellcode on it."
 * "The Gnome calculator was used to perform these calculations and the results were verified using the Qalculate! calculator and WolframAlpha (15) since spreadsheets are unable to perform these calculations."