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Thanks to Show HN I will be given tons of links to softwares I would never have found by myself :-)

I'm also using Qalculate! and never had an issue with it. Maybe I don't require complex enough calculations but whenever I want some quick basic math, it's a quick keybinding away and there's a history screen below the input screen so sometimes I don't even have to type anything to see the answer.

This also has a nice command line interface for those who prefer the terminal.