Drilling formula software survey

what do you think if drillingformula.com will have a free software (freeware), specially for calculating some essential drilling formulas?

Please provide me some feedbacks.

My friend offers help to write a program but I would like to ask you all first.

what do you think if drillingformula.com will have a free software (freeware), specially for some essential drilling formulas? Please provide me some feedback. My friend offers help to write a program but I would like to ask you all first.

?