SIGAPL is the ACM's special interest group devoted to APL.

Some interesting APL links here, but they have to be found.

special interest groups APL and J.

Great APL site, specially if you speak Finnish. However, there is much in English also, particularly the very famous FinnAPL Idiom Library.

The French Association for the promotion of APL

Index of APL associations.

Contains committee listing, membership details, a current members listing, and contacts.