In 1990, Linus Torvalds, who’s popularly known as the father of Linux, further worked on UNIX and eventually came up with a viable Linux kernel that he dubbed Linux. The kernel opened doors to the realization of an operating system with utilities and other application programs, away from the proprietary UNIX system. Going forward, Linux was made opensource and free to use under the GNU/GPL license model. This made way for other distributions such as Slackware with a Linux kernel, GNU tools such as GCC compiler, X windows system ( The Graphical User Interface ), and other additional BSD components.Nowadays, there are hundreds upon hundreds of Linux distributions that are listed.