Vector's APL Product Guide - Index of Companies and Organisations - http://www.vector.org.uk/?fetch=prodguid/index1.inc
Rex Swain - Independent consultant specializing in APL with over 25 years professional experience. - http://www.rexswain.com/
APL Borealis - The pre-eminent source for APL products and services in Canada. - http://www.aplborealis.com/
Customized Applications, Inc. - Customized applications and programming services, including rapid application development in APL. - http://customized-applications.com/
Optima Systems - A UK company specialising in bespoke APL software. - http://www.optima-systems.co.uk/
Snake Island Research, Inc. - Software development and consulting firm specializing in solving APL performance problems and training programmers. Technical Report on APEX APL compiler. APL (and related compiler/parallel) BiBTeX bibliographic files. APL fonts for LaTeX. - http://www.snakeisland.com/
CoherentSystems: CoSy - Computerized living with the APL-based CoSy NoteComputer. Free downloads! - http://www.cosy.com/
Lescasse Consulting - French APL based company. Proudly announce a form "driven by an APL+Win Web Server". - http://www.lescasse.com/
Causeway Graphical Systems Ltd. - Produces a range of graphical and reporting tools. Includes details of collaborations, products, support, and demos. - http://www.causeway.co.uk/