Gurufocus - Historical financial data and insider holdings
TradingView - The best charting tool for crypto and stocks
FinViz - Stock screener for investors and traders, financial visualizations.
eToro - The social investment network that connects traders from around the globe and enables them to share...
Yahoo! Finance - At Yahoo Finance, you get free stock quotes, up-to-date news, portfolio management resources, international market data, social interaction and mortgage rates that help you manage your financial life.
Robinhood - Free stock trading service.