Microsoft Mathematics 4.0
Microsoft did a good thing. Released Microsoft Mathematics 4.0. It is free! Available for Windows (both x86 and x64). Download it here. This is what is left from Microsoft Student and Encarta. Now it is a standalone application. Great tool and easy to use. I’m glad that Microsoft did not phase it out. The tool supports symbolic math, integration, differentiation, solve equations, and has a graphing calculator and unit conversion tool. It solves problem and also shows how it solved them. I wish it offered an interface to develop plug-ins. That would attract some of R, MATLAB, and Mathematica users.