GNU APL is a free interpreter for the programming language APL.

The APL interpreter is an (almost) complete implementation of ISO
standard 13751 aka Programming Language APL, Extended.

The APL interpreter has implemented:

  - nested arrays and related functions
  - complex numbers, and
  - a shared variable interface

In addition, GNU APL can be scripted.

WWW: https://www.gnu.org/software/apl/