The old Tcl port:
http://ftp.uni-stuttgart.de/pub/systems/acorn/acornet/long/info/www/l/i_51.html
Is particularly dated - it is from 1996 (version 7.4), is 26-bit and
doesn't have Tk - there's never been any port of that to RISC OS, TTBOMK.
The version I have running is 8.4, but 8.5/8.6b should not be any
problem.
Anyway, if someone is really interested, I can look at polishing it
up for a proper release. Alternatively, if you have GCCSDK,
you can build this directly yourself - just make sure you have
the latest ChoX11 changes.