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.
TradingView - The best charting tool for crypto and stocks
CloudQuant - Crowd based algorithmic trading development and backtesing for stock market trading.
eToro - The social investment network that connects traders from around the globe and enables them to share...
Quantopian - Your algorithmic investing platform
Robinhood - Free stock trading service.