Robinhood - Free stock trading service.
Scout Finance - Free finance app that's like having a Bloomberg in your pocket. Download:
TradeStation - Whether you trade stocks, ETFs, options or futures, TradeStation’s award-winning tools and...
Cappio - Stock research that isn't overwhelming
OptionsHouse - OptionsHouse is an online stock trading platform with an easy-to-use interface.
StockDock - Live stock prices right in your macOS Dock