Trigger Finance - IFTTT for the stock market
Robinhood - Free stock trading service.
SparkFin - Learn the markets for free, profit forever.
TradingView - The best charting tool for crypto and stocks
Stockflare - Stockflare helps anyone pick stocks, easily. Investing doesn’t have to be complicated.
StockTwits for Slack - Fun, real-time stock quotes in Slack