Editing APL (programming language) (section)

=== GNU APL ===
GNU APL is a free implementation of Extended APL as specified in ISO/IEC 13751:2001 and is thus an implementation of APL2. It runs on [[Linux]], macOS, several BSD dialects, and on Windows (either using [[Cygwin]] for full support of all its system functions or as a native 64-bit Windows binary with some of its system functions missing). GNU APL uses [[Unicode]] internally and can be scripted. It was written by Jürgen Sauermann.<ref name="GNU">{{cite web |url=http://directory.fsf.org/wiki/GNU_APL |title=GNU APL|website=directory.fsf.org |publisher=[[Free Software Directory]] |access-date=September 28, 2013}}</ref>

[[Richard Stallman]], founder of the [[GNU Project]], was an early adopter of APL, using it to write a text editor as a high school student in the summer of 1969.<ref name="Berättar">{{cite web|last1=Stallman|first1=Richard M. |url=http://www.lysator.liu.se/history/garb/txt/87-2-rms.txt |title=RMS Berättar|access-date=April 22, 2018|archive-url=https://web.archive.org/web/20181126072301/http://www.lysator.liu.se/history/garb/txt/87-2-rms.txt|archive-date=November 26, 2018|url-status=dead}}</ref>