TastyWorks
Super cheap options commission.
https://www.tastyworks.com
Robinhood
Commission free and no minimum to open.
http://www.robinhood.com
Stockpile
Dollar commissions, interface very simple, platform limited in types of securities and trades available.
https://www.stockpile.com
Interactive Brokers
Cheapest trading platform for Europeans, very good API, anal registration process. $0.005/share, $1 minimum. Lowest margin interest. Free API access
http://www.interactivebrokers.com
TD Ameritade
$6.95 commission per trade. No minimum to open. Fantastic data/charting through their free ThinkorSwim service
http://www.tdameritrade.com
Degiro (Cheap European Broker)
Another cheap platform for Europeans, recently announced increase in commission fees. Fast registration process
http://www.degiro.eu
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