CalcGeek is a full functional calculator which is capable of understanding expressions 1.Allow you to input expression directly 2.Fully written in java, make it capable to run in multiple platform, including Windows, Linux, 3.MacOS, BeOS. 4.Support trig function, logarithm funciton. 5.Support to display and calculate in degrees, radians, grads as well as Hex, Dec, Oct, Bin mode. 6.Simple interface, very easy to use.