The document discusses the history and philosophy of open source software and the free software movement. It describes how Richard Stallman founded the GNU project in 1984 to develop free software to protect users' freedom. Stallman developed the GNU General Public License (GPL) to ensure software remains free. Linux kernel developer Linus Torvalds combined GNU software with his kernel to create the GNU/Linux operating system. The open development model allowed the community to quickly improve the software through collaboration over the Internet. Unintended consequences of open source include the creation of wikis, blogs, and citizen websites that promote transparency and civic participation.