Quantopian - Your algorithmic investing platform
TradingView - The best charting tool for crypto and stocks
CloudQuant - Crowd based algorithmic trading development and backtesing for stock market trading.
Token Metrics - Find profitable crypto investments and filter out scams.
quantra - A public API for quantitative finance made with Quantlib
TradingLite - Next-generation technical analysis platform Real-time liquidity heatmap, order-flow tools, indicator scripting plus more, whilst supporting all major crypto exchanges.