GNAT is a high-quality, complete compiler for Ada95, integrated into
the GCC compiler system and distributed freely, with sources, under the
Copyright of the Free Software Foundation.  It is maintained by Ada Core
Technologies.  For more info, check the web site http://www.gnat.com.

A free copy of the gnu-ada compiler can be obtained by an anonymous ftp 
to cs.nyu.edu from the directory /pub/gnat.

Mirror Sites:

US sites:
ftp://ftp.cdrom.com/pub/languages/ada/compiler/gnat/distrib
ftp://wuarchive.wustl.edu/languages/ada/compiler/gnat/distrib

European sites:
ftp://ftp.cs.kuleuven.ac.be/pub/Ada-Belgium/mirrors/gnu-ada
ftp://ftp.dit.upm.es/mirror/cs.nyu.edu/pub/gnat
ftp://ftp.cs.tu-berlin.de/pub/gnu/gnat
ftp://ftp.cci.de/pub/Ada/gnat
ftp://ftp.informatik.rwth-aachen.de/pub/mirror/cs.nyu.edu/pub/gnat
ftp://ftp.ibp.fr/pub/gnat
ftp://ftp.cnam.fr/pub/Ada/PAL/compiler/gnat/distrib
ftp://ftp.eunet.no/pub/gnu/gnat
ftp://ftp.fsz.bme.hu/pub/ada/gnat
ftp://snowwhite.it.brighton.ac.uk/gnat

Australia site:
ftp://ftp.canberra.edu.au/pub/ise/gnat