GNU APL

GNU APL is a free and (almost) complete implementation of Extended APL as specified in ISO/IEC 13751:2001 and is thus similar to APL2. It runs on GNU/Linux and on Windows using Cygwin, and uses Unicode internally. GNU APL was written and is being maintained by GNU APL community.

GNU APL interpreter includes:


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

In addition, GNU APL can be scripted.

Richard Stallman, founder of the GNU Project, had been an early adopter of APL, using it to write a text editor as a high school student in the summer of 1969.

As of recently, there is an (experimental) online version of GNU APL.