I use myTrack (www.myTrack.com)
They have a no-frills trading website I use when away from home.
They do provide free 'direct access' software (no browser required), that is very quick. R/T charts, Streaming quotes, Level II, option chains etc. are available. Depending on how much you trade per month, you recieve a rebate that may cover the price of the service plan you choose. If you have an account with them, the basic service plan is free. You can also send an 'electronic check' to open/increase account & use those funds the next day.
Jim