From The Free On-line Dictionary of Computing (19 January 2023):
GNU assembler
gas
(GAS) A Unix assembler for the GNU project. Many CPU
types are handled and COFF and IEEE-695 formats are
supported as well as standard a.out.
Current version 2.2 ported to Sun-3, Sun-4, i386,
386BSD, BSD/386, Linux, PS/2-AIX, VAX, Ultrix,
BSD, VMS.
The assembler has been merged with GNU Binutils.
E-mail: <bug-gnu-utils@gnu.org>.
(1995-04-18)