Linux

< Operating systems
 * Wikipedia: https://en.wikipedia.org/wiki/Linux

Introduction
Linux is one of the most prominent examples of free and open-source software collaboration. The source code may be used, modified and distributed—commercially or non-commercially—by anyone under the terms of its respective licenses, such as the GNU General Public License.

Index

 * Linus Torvald: https://www.youtube.com/watch?v=o8NPllzkFhE