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XCalc is an infix calculator for mobile devices that support J2ME, MIDP 1.0 and CLDC 1.0.Its main features are 2d and 3d plotting of functions and its usability. It uses the Real.java library http://sourceforge.net/projects/real-java.
MTAC is a powerful, yet small and easy-to-use symbolic math program written in Java. It supports complex numbers, symbolic differentiation, numerical integration, plotting, and more.