CanadaCalc is a free suite of Canadian finance calculators — TFSA, FHSA, mortgage, income tax (all 10 provinces), retirement, and compound interest. My favorite is the Stock Lookback tool: enter a ticker and purchase date, see what it's worth today vs. the S&P 500. Works for US and TSX tickers. No signup, nothing stored, built with real 2025 Canadian rules (proper semi-annual mortgage compounding, accurate tax brackets). Free forever. Feedback welcome! 🍁