UNIX, formerly known as Bell Labs Ken Thomson written in assembly language, and later by the Dennis Ritchie to c language rewritten, it is called UNIX.
Stallman advocates the GNU project aims to establish a free, open UNIX operating system. Stallman advocates free software, emphasizing its software free to obtain, copy, modify, and redistribute and regulate the GPL license mode, any GPL (General Public License) software are not simply selling only its software, the software can not be modified authorization.
Linux operating system developed by Linus Finn, Linux's success lies in: Minix (UNIX), to produce the GNU project, Internet, POSIX, and virtual teams.
Authorization in line with the concept of open source considerable, well-known are: Apache (Apache), BSD, GPL, MIT.
