This includes Ti Vo and similar DVR devices, network routers, facility automation controls, televisions, The development of Linux is one of the most prominent examples of free and open-source software collaboration.
The underlying 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.
The GNU Project, started in 1983 by Richard Stallman, had the goal of creating a "complete Unix-compatible software system" composed entirely of free software. Later, in 1985, Stallman started the Free Software Foundation and wrote the GNU General Public License (GNU GPL) in 1989.
By the early 1990s, many of the programs required in an operating system (such as libraries, compilers, text editors, a Unix shell, and a windowing system) were completed, although low-level elements such as device drivers, daemons, and the kernel, called GNU/Hurd, were stalled and incomplete.
Torvalds initiated a switch from his original license, which prohibited commercial redistribution, to the GNU GPL.
Later, in a key pioneering approach in 1973, it was rewritten in the C programming language by Dennis Ritchie (with the exception of some hardware and I/O routines).