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There are several technology websites with a Linux focus. Print [[magazine]]s on Linux often include [[cover disk]]s including software or even complete Linux distributions.<ref>{{cite web | url=http://www.linuxformat.co.uk/dvd/ | title=Linux Format DVD contents | author=[[Linux Format]] | accessdate=2008-01-17 }}</ref><ref>{{cite web | url=http://www.linux-magazine.com/resources/current_issue | title=Current Issue | author=[[Linux Magazine|linux-magazine.com]] | accessdate=2008-01-17 }}</ref>
Although [[Linux distributions]] are generally available without charge, several large corporations sell, support, and contribute to the development of the components of the system and of [[free software]]. Analysis of Linux code—from December 2008 to January 2010—showed 75 percent of the code was developed by programmers working for corporations, leaving about 18 percent to the traditional, open source community.<ref>{{cite web | url=http://apcmag.com/linux-now-75-corporate.htm | title=75% of Linux code now written by paid developers
| author=[[APC]] | accessdate=2010-01-22 }}</ref>
The [[free software licenses]], on which the various software packages of a distribution built on the Linux kernel are based, explicitly accommodate and encourage commercialization; the relationship between a Linux distribution as a whole and individual vendors may be seen as [[symbiosis|symbiotic]]. One common business model of commercial suppliers is charging for support, especially for business users. A number of companies also offer a specialized business version of their distribution, which adds proprietary support packages and tools to administer higher numbers of installations or to simplify administrative tasks. Another business model is to give away the software in order to sell hardware.
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