Free software

Free software is defined as software, which can be copied, studied and modified without restriction. Freedom from such restrictions is central to the concept of free software.
Open source and free software refer to the same program or source code, but each term represents a different emphasis on the important of freedom (free software) and technical progress (open source).

“Software development for the GNU operating system began in January 1984, and Free Software Foundation (FSF) was founded in October 1985. He introduced a "free software" definition and "copyleft", designed to ensure software freedom for all. [1] Some reacted strongly against Stallman's position as idealistic nonsense and he was strongly mocked and criticised. Present day — Free Software is a highly successful international effort, producing software used by individuals, large organisations, and even entire countries. (http://en.wikipedia.org/wiki/Free_software)

Free software:
- GNU/Linux, BSD
- Programming languages: Perl, PHP, Ruby.
- Mozilla, Firefox
- MediaWiki, the software that runs WikiPedia

Linux – This is the best example of open source and free software.

MediaWiki – This is software packaged under the GNU General Public License, it is written in PHP with other aspects. It was originally written for Wikipedia by a German student.

Firefox is a free, open source, cross platform, graphical web browser developed by
Mozilla Company. Firefox has become one of the most downloaded free and open source applications, especially with home users. The Floss community forced them to change their name from Firebird, which is used by another company to mozilla firefox.

Php is a free, open source programming language used mainly for developing dynamic web content. PHP offers lots of interaction with database management systems such as MySQL, IBM DB2, SQLite, and runs on many operating systems, Linux, Microsoft, Mac OS X.