7. RealCalc Scientific Calculator

If you are studying classes that need a scientific calculator such as a physics class, then you can substitute this for a bulky hand held model. RealCalc is a great choice even if you accidently forgot your scientific calculator or just don’t want to buy one. The heavy duty version of this program costs only $3.49 and is called RealCalc Plus, but this free version still helps out if you need a scientific calculator and don’t have one.