History: Hurd is a microkernel created as part of the GNU project with the intention of replacing the Unix kernel, based on CMU’s Mach kernel. Though Hurd has been a long time in development, with work having begun in 1990, it’s still not ready for production use. Ironically and instead, it’s the Linux kernel that became popular for use with GNU’s other components. Linus Torvalds said that if Hurd had been ready much earlier, he might not even have bothered creating Linux in the first place. Since then, though, Torvalds has regularly shared his negative opinions of Hurd, many of which are based on his dislike of microkernels.
Quotes: “I think Hurd is dead. ... It has a ‘big vision’, and people forgot about the details, and forgot about admitting when they went wrong.” October 2004
“... Hurd isn't really a microkernel, it's an abomination that makes all other microkernels look bad.” May 15, 2006
“In short: just say NO TO DRUGS, and maybe you won't end up like the Hurd people.” October 4, 2001