(This is not anymore that much related to X, but maybe here are also other
old Atari owners. I think this is kind of interesting also to others in
kind of a obscure "Oh Gosh, are people still doing stuff for
those" -way. :-))
There are no W users I know of, but I recently brushed the dust off the
code, updated it to build with latest GCC, liblua etc. and added Debian
packaging in case somebody wants to recapture the old feel of monochrome
graphics and W programming (it works on X using SDL): http://koti.mbnet.fi/tammat/open.shtml#wws
And there are several emulators for them too, either intended as a
replacement new Atari machines (similar to what Amiga Forever does): http://aranym.org/