https://bulletin.lifeguide.com/gen_calcs/needs_analysis.html
Government of Canada, Mortgage: https://itools-ioutils.fcac-acfc.gc.ca/MC-CH/MC-CH-eng.aspx
CCH (publisher for accountants and lawyers): https://www.cchwebsites.com/content/calculators/CASimpleLoan.html
For an RRSP calculator, do you mean tax savings? If so, Ernst & Young (accounting firm) has a good calculator: https://www.eytaxcalculators.com/en/2021-rrsp-savings-calculator.html
They also have a good calculator to estimate taxes owing: https://www.ey.com/en_ca/tax/tax-calculators
If you are actually looking for an investment growth calculator, I like this one produced by the Government of Ontario: https://www.getsmarteraboutmoney.ca/calculators/compound-interest-calculator/