Qalculate! ( GTK+ GUI): qalculate-gtk.It provides four interfaces: Two GUIs, one using GTK ( qalculate-gtk) and another using Qt ( qalculate-qt), a library for use in other programs ( libqalculate), and a CLI program for use in a terminal ( qalc). 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 supports complex mathematical operations and concepts such as derivation, integration, data plotting, and unit conversion. Qalculate! is an arbitrary precision cross-platform software calculator.

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