Quantopian - Your algorithmic investing platform
MetaTrader5 - World-leading multi-asset platform that allows trading Forex, Stocks, Futures and CFDs.
CloudQuant - Crowd based algorithmic trading development and backtesing for stock market trading.
TradingView - The best charting tool for crypto and stocks
quantra - A public API for quantitative finance made with Quantlib
ProRealTime - Online trading, charting and technical analysis of stocks, futures, forex and commodities.