Warren Smith's MAPLE calculator tool
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If you do
 maple < myfile
then it knows about all kinds of physical constants. Big deal?
Well, the nice thing is all subsequent calculations you do, won't
be real numbers, they will be DIMENSIONED real numbers.
Very handy. For example, here is a run...
> #hmm, I wonder what is the mass-density of jupiter.
> radiusjupiter;

                                           8
                             .6880686480*10  meter

> mjupiter;

                                            28
                              .1898800000*10   kg

> mjupiter / (4*pi*radiusjupiter^3 / 3);

                                             kg
                               1391.538752 ------
                                                3
                                           meter
> #hmm, I wonder how much antimatter it would take, to
> #produce enough energy to boil all the earth's oceans.
> moceans*heatvapwater/(2*c^2);

                                            11
                              .1760212389*10   kg
.