Beware not to buy HP Prime, if you are engineer!

[pier4r]

yes the notation there is terrible, although the pointers are not bad (the site is full of ads though. I did not see it with javascript disabled).

This is better. https://www.fxsolver.com/browse/

Via google is pretty hard to get a good result like (https://www.fxsolver.com/browse/) I am unable to get a proper search string.

"collection engineering formulas" does not yield good results.