To my knowledge... none.
No one with the programming ability, (that I know of) has contacted Charles Earl to see if the source code is available.
TIMXT seems to be the program of choice where the F18A is involved. Not only does TIMXT have full 80 columns, it supports color ANSI graphics, although I believe it's still a work in progress. You of course already know this Greg, I just put it out there for the many newbies we've picked up over the last few months.
Ok I sent him a connect request on linked-in..