QuantConnect - QuantConnect provides a free algorithm backtesting tool and financial data so engineers can design algorithmic trading strategies. We are democratizing algorithm trading technology to empower investors.
Rally Rd. - Invest in blue-chip classic cars like stocks
quantra - A public API for quantitative finance made with Quantlib
Staats - Your personal trading card
Backtrader - Backtrader is a complete and advanced python framework that is used for backtesting and trading.
Alt - Invest in sports cards just like stocks