i don't believe so. i've made a number of false starts and would like to return to it some day. there's some very simple interpreters out there (including one by ken[1] for old unix systems) that might be worth looking at if you want to work on a port and performance isn't critical. note that i haven't found a single APL interpretation that uses the unicode apl characters[2] - a version written with plan9 tools could have a very nice advantage there.
there has also been a lot of discussion in the past 1-2 months about K, a successor to APL, in #plan9. you might ask there; i may have missed a more recent development. [1] everyone says the character set is very jarring working in APL. for me, what's worse is the fact that in that community, "ken", unadorned, refers to a father of the field, a luminary who's example many seek to follow, but it's a totally different person. here, i mean "our" ken. [2] i think A+, the APL-with-extensions from Morgan Stanley, could as an option, but trying it out on OS X gave poor results.
