Has anyone tried this math software:
http://calcpad.net/
The program can be downloaded from
http://calcpad.net/Download/Calcpad_Setup.exe
It is not that powerful, but it is simple, handy and totally free. It supports input forms generation and Html reporting. That makes it a good option for engineering calculations worksheets especially for structural design.
It also supports complex numbers, custom variables and functions, graphing in 1D and 2D, units, numerical methods, conditions (if-else-end if), cycles, comments etc.