Robinhood - Free stock trading service.
TradeStation - Whether you trade stocks, ETFs, options or futures, TradeStation’s award-winning tools and...
Rally Rd. - Invest in blue-chip classic cars like stocks
OptionsHouse - OptionsHouse is an online stock trading platform with an easy-to-use interface.
Freetrade - Invest in stocks & ETFs for free, get started in seconds.
Questrade - Questrade IQ Mobile is everything you need to trade stocks - right in the palm of your hand.