APL is one of the oldest programming languages.
- An APL playstation
- Playing APL
- A partial APL parser
- a modern, freely-available descendant of APL
- JimW's APL Information
- an excellent APL site
- Rex Swain's APL Information
- a decent site for apl links, but even though the page appears to be actively maintained, some of the links are no good.
- Sam Sirlin's APL Page
- a more "into-the-guts-of-things" sort of APL page.
- NARS , or Nested Arrays Research System
- was designed and implemented in the early 1980s as a testbed for new ideas in APL, principally with nested arrays. A quarter of a century later, it's time to try again
- IBMs updated version of the language. It ships with an included Tcl interpreter, for handling programming tasks that APL is not well-suited for.
- "I like APL. I like it because it has a solid fundamental data model, and then elaborates the hell out of it."
- - CMcC, Tcl Chatroom, 2013-12-27
- "APL is a mistake, carried through to perfection. It is the language of the future for the programming techniques of the past: it creates a new generation of coding bums."
- - Edsger Dijkstra