software works on mac natively and connects to IB for data

Even if you were able to find a native application for Mac, I think you would still have to go through IB's API client or Java-based TWS. I don't know of any application aside from TWS that directly connects to IB.
 
IB FIX. you can use the 2400+ pdf that explains in torturing detail how to design a front-end application for use with them.
 
FXI is a standard protocol. Should be no more "torturing" than others.

I was not referring to the FIX being torturous, but the action of having coding a front-end application that does more than the fluff that is provided by 99% of brokers.
 
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