ACM SIGAPL The Association for Computing Machinery's Special Interest Group for Array Programming Languages has some J material.
Albert Stevens
Notes on use of J, and collection of other J related material at
UNB Transportation.
Cliff Reiter's
Gallery of Fractals, Chaos and Symmetry at Lafayette College.
Donald B. McIntyre's
site includes Mastering J Revisited.
Ewart Shaw's
page at University of Warwick has a thorough guide to J.
John Howland's
pages at Trinity University, San Antonio.
Keith Smillie's
J Page at University of Alberta has several excellent introductory articles, including a statistical package written in J.
Ken Gordon has a review
A management perspective of the J programming language among other
recommended data warehousing and compression
articles, some
archived.
Martin Neitzel's
Juggler's page at Gaertner Datensysteme GbR.
Mstat is a standalone package for statistical analysis, developed by Norman Drinkwater at the McArdle Laboratory for Cancer Research, University of Wisconsin.
Oleg Kobchenko's
J Page has several useful J scripts.
郭平欣
J 字典 及
J 語言初步. Ping-Sing Kuo's Chinese translation of the J Introduction and Dictionary and 51-page J Introduction.
Словарь Языка J (
archive,
PDF). Russian translation of J dictionary. This is a working copy, sublect for discussion and change. Please comment on it
here. Periodically (e.g. after J 6.01 is out) it will be assembled into a higher quality releases, made available elsewhere.
Skip Cave's
site includes various historical APL/J papers, as well as digital pictures taken at the J2000 conference in Toronto.
LiteratePrograms Examples of J code elaborated in "literate" style.
Rosetta Code Examples of J code for comparison and contrast with other programming languages.
Vector Journal of the British APL Association with many articles on J.
Wikipedia entry
J programming language