Qalculate! is a powerful desktop calculator that offers versatility and simplicity. It goes beyond basic calculations, providing functions like currency conversion and percent calculation. The calculator comes with customizable functions, unit calculations, physical constants, symbolic calculations, and more. The latest version, 4.7, introduces various improvements such as support for custom default angle units, addition of the Kronecker product function, and updates to the planets dataset. Additionally, there are fixes for various issues, including a fix for the besselj(0, 0) calculation and improvements to the newtonsolve() and secantsolve() functions. Overall, Qalculate! is a comprehensive calculator with a user-friendly interface.
https://qalculate.github.io/