SpeedCrunch

SpeedCrunch is a high-precision scientific calculator that includes 50 preset mathematical functions to do different operations.

These include calculating absolute value, median, maximum and minimum value, product, greatest common factor, logarithm in base 2 or 10, and many others as well. You can select them from the Insert Function option inside the Edit menu.

SpeedCrunch also lets you save an unlimited number of variables. The screen, which is just a block for text, supports several lines and also a sidebar.

Other interesting features that make SpeedCrunch stand out from other applications include: a smart autofill function that makes using the application a lot easier, a history of your most recent operations, and syntax highlight for your calculations.