[0x_rs]

I've found programs such as SpeedCrunch[0] to be extremely more comfortable to use than calculators imitating "classic" designs.

[0] https://speedcrunch.org/

[Darmody]

Speedcrunch is one of the apps that I always keep open. I just alt+ab to it when I need something and do some quick operations with the numerical keyboard and it's able to handle stuff for programming and CS in general.

[smusamashah]

Looks like improved version of CCalc