This website contains many interactive webpages that can be used to calculate everything from
principal stresses and strains, to statistical distributions and loan payments.
A few of the pages are mentioned throughout the site. But many are not.
This page resolves the issue by listing all interactive calculation pages here in one place.
Note that the 1st page,
General Mechanics Calculations,
is unique in that it incorporates the calculation abilities of many pages listed below it.

The screenshot below shows a sample vector calculation page that is mentioned at the bottom of
the vectors.html webpage. As can be seen, several parameters
are entered as inputs (in this case, vector components) and then many quantities are computed
by clicking the "Calculate" button.