Examples of free software
Notable free software:

Operating systems: GNU/Linux, BSD, and Darwin.
GCC compilers, GDB debugger and C libraries.
Servers: BIND name server, Sendmail mail transport, Apache web server, and Samba file server.
Relational database systems: MySQL and PostgreSQL.
Programming languages: Perl, PHP, Python, Ruby and Tcl.
GUI related: X Window System, GNOME and KDE desktop environments.
OpenOffice.org office suite, Mozilla and Firefox web browsers and the GIMP graphics editor.
Typesetting and document preparation systems TeX and LaTeX.
MediaWiki, the software which runs Wikipedia.
The Free Software Directory is a free software project that maintains a large database of free software packages.

Free for All: How LINUX and the Free Software Movement Undercut the High-Tech Titans A story of a group of software hackers from around the world who created an open operating system that rivals Microsoft's. Goes behind the scenes telling us about the creators and users of Linux. Discusses where the Linux movement is going and how it is likely to affect the the high-tech industry. DLC: Linux.

Much free software supports the non-free Microsoft Windows or non-free Unix platforms, and non-free software can support free platforms, although purists prefer all-free software on a free platform such as GNU/Linux.

Free software packages constitute a software ecosystem where software provides services, resulting in mutual benefit: for instance, the Apache web server handling the HTTP protocol, using mod_python to provide dynamic content.
The source of this article is Wikipedia, the free encyclopedia. The text of this article is licensed under the GFDL
 

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