I like to use a REPL (like MATLAB or Python) where I can enter expressions with a real keyboard instead of hunting and pecking the skeumorphic calculator GUI. T

I like to use a REPL (like MATLAB or Python) where I can enter expressions with a real keyboard instead of hunting and pecking the skeumorphic calculator GUI. This also allows me to see the history of my calculations without resorting to the weird mirrored calculator. Even something like a TI-85 graphing calculator offers this.