Can't start this list without mentioning ThinkorSwim. This is one of our favorite charting tools. You can also execute trades directly inside the platform.
Options: $6.95 + $0.75 fee per contract / Stocks: $6.95 / Futures & Options on Futures $2.25 fee per contract (plus exchange & regulatory fees)
TastyWorks is a great brokerage with low commissions, fast execution, and easy to use platform.
Options on stock is only $1 with no closing fees. Opening trade for stocks is $5 (unlimited shares), and Futures trading starts at $1.25 per contract.
Robinhood offers commission-free stock and ETF trades on both their mobile app (available for iOS and Android) and webpage.