Please support the people that make this software by going to there web sites, they all have plenty more good stuff to offer
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This is the best scientific calculator i have seen. It has about 200 function buttons for math in all fields of science. and it is free. download Yet another scientific calculator. it also is free, but too large for web site on cdrom only.
Converter type program, converts all  constants math, physics, electrical etc etc download Convert.exe.
One line expression evaluator with memory of 100 calculations. Go back and re-edit any of the 100 or load or save them to a file. Svelt quick loading calculator with very efficient keyboard use. Help file viewer doubles as big history viewer and options menu. Has 54 built in functions including unit conversions and hyperbolic functions and 30 fixed physical constants. On cdrom only
Software developed by Fermi National Accelerator Laboratory. The Fermilab Software Tools Program (Fermitools) is an effort to provide the internet community with the Fermilab developed software packages. here is link
 QuickField For designing magnetic things like motors and inductors etc. Quickfield. is a very efficient Finite Element Analysis package for electromagnetic, thermal, and stress design simulation with coupled multi-field analysis. It combines a family of analysis modules using the latest solver technology with a very user-friendly model editor (preprocessor) and a powerful postprocessor. On cdrom only QF51ST6
FEMM a tool for solving 2-D planar + axisymmetric magnetic and electrostatic problems (including linear and nonlinear magnetostatic problems and linear low frequency harmonic problems).  For magnetostatic and electrostatic problems, a Conjugate Gradient solver using a Symmetric Successive Over-Relaxation (SSOR) preconditioner is employed.  For harmonic problems, a complex-symmetric implementation of the BiConjugate Gradient algorithm is used, again with the SSOR preconditioner. Includes 108 page manual + Maxwell's equations The only thing it lacks is the collage course needed to learn how to use it. download femm40bin.exe  NOT ON CD-ROM