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.
Ellevest - An investing platform built for women
Quantopian - Your algorithmic investing platform
Richie Invest - An app that lets you invest with your friends
CloudQuant - Crowd based algorithmic trading development and backtesing for stock market trading.
Robinhood - Free stock trading service.