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. An analysis of the Linux kernel in 2017 showed that well over 85% of the code developed by programmers who are being paid for their work, leaving about 8.2% to unpaid developers and 4.1% unclassified.[96] Some of the major corporations that provide contributions include Intel, Samsung, Google, AMD, Oracle and Facebook.[97] A number of corporations, notably Red Hat, Canonical and SUSE, have built a significant business around Linux distributions.
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