Robinhood - Free stock trading service.
MetaTrader5 - World-leading multi-asset platform that allows trading Forex, Stocks, Futures and CFDs.
invstr - Investing for everyone (with fantasy $$$)
ProRealTime - Online trading, charting and technical analysis of stocks, futures, forex and commodities.
M1 Finance - M1 helps you manage your money by automatically putting it to work in a customizable portfolio
TradingView - The best charting tool for crypto and stocks