Robinhood - Free stock trading service.
SharesInside - Makes investing easy
TradeStation - Whether you trade stocks, ETFs, options or futures, TradeStation’s award-winning tools and...
Sumday - Investing how you least expect it
OptionsHouse - OptionsHouse is an online stock trading platform with an easy-to-use interface.
SprinkleBit - Crowdsourced investing, let's invest together!