Looking for a Linux based FSK RTTY app -- and Winkey too!

Hello Linux HAMs,

I've been happily using FLdigi for my various HF digital modes but I'd 
like to try proper FSK-based RTTY with my Yaesu FT-950.  Unfortunately, 
Fldigi doesn't natively support FSK modes nor the WinKeyer2 system:

      http://www.w1hkj.com/FldigiHelp/PseudoFSK.html

I'm using a US Interface Navigator unit here

     http://usinterface.com/naviusa_004.htm

which supports true FSK via a basic input via it's fourth serial port 
(/dev/ttyUSB3).  I'm curious if anyone can make some recommendations on 
either a way to modify FLdigi to support this interface or some 
alternative program to use this interface?

On a similar note, is anyone aware of any Linux program that support the 
Winkeyer2 system?  It's supported on Windows apps like DM780 and MixW so 
I hope similar things can be said for Linux.  This supported via the 
third serial port (/dev/ttyUSB2)

Ideas?

--David
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