Day-Trading Software For Linux/BSD?

DayTrader Dreaming of Penguins asks: "For the past few weeks, I've been on an avid search for something I would have thought would be easy to find. I visited chat rooms, Web sites, and news groups. But I'm still left empty handed. I'm looking for the tools and indicators for DayTrading that could be used under Linux. Things like real-time charts, and NASDAQ Level 2 windows are virtually unavailable in one software package for the Linux Community. Due to lack of option I had to give up my Linux machine for one with a window. With software like DTNIQ, WindowOnWallStreet, and countless other services available for Windows, why is it Linux has yet to capitalize? Maybe I'm just looking in the wrong places?" How difficult would it be for a new project to break into this market? It would seem that such tools are based on incredibly proprietary (read: expensive) protocols and hence Free Software un-Friendly.