The Qalculate! project develops a multi-purpose, desktop calculator application and its associated comprehensive library of functions. Designed to be simple to use but providing power and versatility normally reserved for complicated mathematical tools, it provides solutions for everyday needs such as currency conversion and percent calculation. Features include a unit calculations and conversion, physical constants, symbolic calculations (including integrals and equations), arbitrary precision, uncertainty propagation, interval arithmetic and plotting, all through user-friendly interfaces (GTK+ GUI and CLI).

Qalculate! Project Metrics: https://www.openhub.net/p/qalculate