Links
Roger K.W. Hui, Dyalog Limited, Canada
Morten J. Kromberg, Dyalog Limited, United Kingdom
History of Programming Languages IV (HOPL IV)
APL Since 1978
ACM SIGAPL The Association for Computing Machinery's Special Interest Group for Array Programming Languages has some J material.
BrianSchott's YouTube J screen casts: download and install, an introduction via Labs, browsing locales with cobrowse.ijs, and a simple openGL screen robot. Search for "J Programming Language" for more.
Cliff Reiter's Gallery of Fractals, Chaos and Symmetry at Lafayette College.
Donald B. McIntyre's archived site https://web.archive.org/web/20191218165417/http://www.mcintyre.me.uk/
Ewart Shaw [1] .
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.
Wikipedia entry J programming language