"GNU, which is a recursive acronym that stands for GNU is Not
Unix, first set out in 1984 to develop a Unix-like operating system
as Free Software.
"It is now gearing up to provide a 'free' version of Mozilla's
(not-so-free) Firefox browser. The GNU version is called IceWeasel
and is part of the GNUzilla effort from GNU. The Free Software
Foundation (FSF) is the principal sponsor of the GNU
Project..."