Kalk - This is a java calculator. This has some more features than an ordinary calculator. Other that performing the basic maths operations, this can calculate sin, cos, tan, log, asin, acos, atan and antilog of a number.
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TouchMaths_ME The program TouchMaths (for touchscreen mobile phones) contain a set of revolutionary mathematical applications (Professional Calculator, Graph 2D, Function solver, Integral solver, Equation solver and Linear system solver)
Jasymca Jasymca - Jasymca is a symbolic calculator. It solves and manipulates equations, handles basic calculus problems, and provides a few more typical functions of computer algebra systems. The syntax is loosely related to GNU-Maxima. While it is fun to play with mobile devices, it teaches the use of computer algebra systems, and may even be used to solve some real world problems
x_calc Universal free, every day use calculator with scientific features. One of top.
Good for simple and advanced calculations!
Frink Frink - Frink is a programming language and calculating tool designed to help you make real-world calculations.
Frink is different than other calculating tools in that it tracks units of measure through all calculations. Thus, you can add feet and meters, multiply by grams, divide by pounds, and Frink does the right thing through all calculations