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ACM SIGAPL Home Page
SIGAPL is the ACM's special interest group devoted to APL.
APL Organizations
special interest groups APL & J
Association francophone pour la promotion du langa
The French Association for the promotion of APL
Capital PC User Group (CPCUG) Home Page
Some interesting APL links here, but they have to be found.
FinnAPL Home Page
Great APL site, specially if you speak Finnish. However, there is much in English also, particularly the very famous FinnAPL Idiom Library.
The British APL Association
Contains committee listing, membership details, a current members listing, and contacts.
Vector's APL Product Guide
Find other organisations here.