}}</ref> and in December 1992 it was made available under version 2 of the [[GNU General Public License]].<ref name="gpl_version">{{cite web |url=ftp://ftp.kernel.org/pub/linux/kernel/Historic/v0.99/linux-0.99.tar.Z |archive-url=https://web.archive.org/web/20170130050958/ftp://ftp.kernel.org/pub/linux/kernel/Historic/v0.99/linux-0.99.tar.Z |url-status=dead |archive-date=2017-01-30 |title=z-archive of Linux version 0.99 |website=kernel.orgThe Linux Kernel Archives |date=December 1992 }}</ref> Combined with the operating system utilities already developed by the GNU project, it allowed for the first operating system that was free software, commonly known as [[Linux]].<ref>{{cite web |author=Balsa |first=Andrew D. |title=The linux-kernel mailing list FAQ |url=http://vger.kernel.org/lkml/#s1-1 |archive-url=https://web.archive.org/web/20121001231709/http://vger.kernel.org/lkml/#s1-1 |archive-date=2012-10-01 |access-date=2013-06-13 |work=The Linux Kernel Archives |publisher=Kernel.org |quote=...we have tried to use the word "Linux" or the expression "Linux kernel" to designate the kernel, and GNU/Linux to designate the entire body of GNU/GPL'ed OS software,... ...many people forget that the linux kernel mailing list is a forum for discussion of kernel-related matters, not GNU/Linux in general...}}</ref><ref>{{cite web
