qalculate-gtk (GTK interface to libqalculate)

Qalculate! is a multi-purpose cross-platform desktop calculator. It is
simple to use but provides power and versatility normally reserved for
complicated math packages, as well as useful tools for everyday needs
(such as currency conversion and percent calculation). Features include
a large library of customizable functions, unit calculations and
conversion, symbolic calculations (including integers and equations),
arbitrary precision, uncertainty propagation, interval arithmetic,
plotting and a user-friendly interface.
