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free version of the programming language APL

GNU APL is an interpreter for APL as described in ISO standard 13751, aka. "Programming Language APL, Extended".

This free version of the programming language APL has already implemented the latest and greatest features (nested arrays and related functions, complex numbers, shared variables) and is intended to be a full implementation of the standard.

GNU APL has builtin support for Emacs (gnu-apl-mode).


info manual for GNU APL

GNU APL has a predefined keyboard layout in order to produce APL characters when the "Alt" key is held down. The layout can be customized by the program xmodmap and a new keyboard mapping table like "apl.xmodmap" provided in source:

xmodmap apl.xmodmap

Text files beginning with #!apl run the interpreter as a shell with the subsequent lines as input.

Heckert gnu.small.png This is a GNU package:apl


Download version 1.6 (stable)
released on 28 August 2016

VCS Checkout



LicenseVerified byVerified onNotes
License:GPLv3Genium10 November 2016

Leaders and contributors

Jürgen Sauermann Author and Maintainer of GNU APL

Resources and communication

AudienceResource typeURI
Reporting BugsE-mailbug-apl@gnu.org
DeveloperVCS Repository Webviewhttp://svn.savannah.gnu.org/viewvc/?root=apl
Reporting BugsMailing Listhttps://lists.gnu.org/mailman/listinfo/bug-apl

Software prerequisites

Required to use"Terminal (-emulation) with Unicode support"

This entry (in part or in whole) was last reviewed on 10 November 2016.


"Author and Maintainer of GNU APL" is not in the list (Maintainer, Contributor, Developer, Sponsor, Unknown) of allowed values for the "Role" property.

"Reporting Bugs" is not in the list (General, Help, Bug Tracking, Support, Developer) of allowed values for the "Resource audience" property.

"Reporting Bugs" is not in the list (General, Help, Bug Tracking, Support, Developer) of allowed values for the "Resource audience" property.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.