Dave Ramsey's investment calculator: https://www.daveramsey.com/smartvestor/investment-calculator
Chris Hogan's R:IQ Calculator: https://www.chrishogan360.com/riq/
College Cost Calculator: https://www.americanfunds.com/individual/planning/tools/ext/college-savings-calculator
Mortgage Payoff: https://www.daveramsey.com/mortgage-payoff-calculator