Vaughan-Nichols, Steven J. "Opinion: The top 10 operating system stinkers", Computerworld（英語版）, April 9, 2009: "…after more than 25 years in development, GNU remains incomplete: its kernel, Hurd, has never really made it out of the starting blocks. […] Almost no one has actually been able to use the OS; it's really more a set of ideas than an operating system."
Stallman, Richard. “Stallman describing Hurd progress”. The Free Software Movement and the Future of Freedom; March 9th 2006. Zagreb, Croatia: FSF Europe. 2010年8月2日時点のオリジナルよりアーカイブ。2009年10月25日閲覧。 “it took many many many years to get this kernel to run at all, and it still doesn't run well, and it looks like there may be fundamental problems with this design, which nobody knew about back in 1990.”
“What is GNU?”. The GNU Operating System. Free Software Foundation (2009年9月4日). 2009年10月9日閲覧。 “The name ‘GNU’ is a recursive acronym for ‘GNU's Not Unix‘; it is pronounced g-noo, as one syllable with no vowel sound between the g and the n.”
“A GNU Head”. Free Software Foundation (FSF) (2011年7月13日). 2011年7月27日閲覧。
“A Bold GNU Head”. Free Software Foundation (FSF) (2011年7月13日). 2011年7月27日閲覧。
“GNU 30th Anniversary”. Free Software Foundation (FSF) (2013年10月8日). 2014年12月15日閲覧。
groklaw.net
Peter H. Salus. “The Hurd and BSDI”. The Daemon, the GNU and the Penguin. 2008年8月18日閲覧。 “It is now perfectly obvious to me that this would have succeeded splendidly and the world would be a very different place today.”
Stallman, Richard. “Stallman describing Hurd progress”. The Free Software Movement and the Future of Freedom; March 9th 2006. Zagreb, Croatia: FSF Europe. 2010年8月2日時点のオリジナルよりアーカイブ。2009年10月25日閲覧。 “it took many many many years to get this kernel to run at all, and it still doesn't run well, and it looks like there may be fundamental problems with this design, which nobody knew about back in 1990.”
Vaughan-Nichols, Steven J. "Opinion: The top 10 operating system stinkers", Computerworld（英語版）, April 9, 2009: "…after more than 25 years in development, GNU remains incomplete: its kernel, Hurd, has never really made it out of the starting blocks. […] Almost no one has actually been able to use the OS; it's really more a set of ideas than an operating system."
