The Linux Kernel
One of Linux’s greatest strengths is that its source code is available to anyone who wants it. The GNU GPL (General Public License) under which Linux is distributed even allows you to tinker with the source code and distribute your changes! Real changes to the source code (at least, those to be taken seriously) go through the process of joining the official kernel tree. This requires extensive testing and proof that the changes will benefit Linux as a whole. At the end of the approval process, the code gets a final yes or no from a core group of the Linux project’s original developers. It is this extensive review process that keeps the quality of Linux’s code so noteworthy.
For system administrators who have used other ...