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
quantra - A public API for quantitative finance made with Quantlib
Richie Invest - An app that lets you invest with your friends
Quantreex - An automated trading platform that you let you create trading strategies intuitively.
Robinhood - Free stock trading service.