Windows Calculator, Google Calculator, Soulver, SpeedCrunch, RealCalc Scientific Calculator, Numi, Convertbot, MyScript Calculator, Free Currency Converter, fxSolver, Excalibur, Napkin Calculator and Notepad, Qalculate!, GeoGebra Scientific Calculator, OpalCalc, Notepad Calculator, Calcbar, Abacus, Online Terminal Calculator, A to Z Converter, Getmathcharts.com, NekoCalc Notepad Calculator, XCALC, Convertr, Linux Extcalc are some alternatives to Caligator.