I'm a big fan of https://qalculate.github.io/ https://qalculate.github.io/. It has a nice GUI which can be used interchangeably with the CLI version. It also h

I'm a big fan of https://qalculate.github.io/ https://qalculate.github.io/. It has a nice GUI which can be used interchangeably with the CLI version. It also has units, many built-in physical constants, currency conversion, matrices and probably tons of other stuff I don't know about. I don't think it can be easily ran in a browser though.