Optima Systems(27th April, 2005): A UK company specialising in bespoke APL software.
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APL Borealis (): The pre-eminent source for APL products and services in Canada.
Customized Applications, Inc. (): Customized applications and programming services, including rapid application development in APL.
J Software (): Modern high performance, general purpose programming language, ideal for complex analytics and data manipulation. APL inventor Kenneth Iverson formed Iverson Software and works here. Free evaluation download.
Causeway Graphical Systems Ltd. (): Small firm doing some amazing things in APL. Note their work with APL/PostScript with their "RainPro" and "NewLeaf" products. Read the publications...
Rex Swain's Home Page (): Many articles of interest to new and old APLers, an interesting smattering of information on other languages (REXX, Perl, HTML), and much other information. A site of interest not only to APLers, but to many computer users!