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[http://www.cozx.com/~dpitts/ibm7090.html Dave Pitts' IBM 7090/7094 Page] {{webarchive|url=https://web.archive.org/web/20150827134534/http://www.cozx.com/~dpitts/ibm7090.html |date=2015-08-27 }} – An example of distributed source: Page contains a link to [[IBM 7090/94 IBSYS]] source, including COBOL and FORTRAN compilers.
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and [[systems programming|systems programmers]] commonly made small local additions or modifications and exchanged them with other users. The SHARE library and the process of distributed development it fostered was one of the major origins of [[Open-source software|open source]] software.<ref>{{cite web |url=http://www.soa-pipeline.com/news/169400167 |archiveurl=https://web.archive.org/web/20060324140930/http://www.soa-pipeline.com/news/169400167 |archivedate=March 24, 2006 |title=SHARE, IBM User Group, To Celebrate 50th Anniversary |first=David |last=Gardner |publisher=TechWeb News |date=August 17, 2005}}</ref>
In 1959 SHARE released the [[SHARE Operating System]] (SOS), originally for the [[IBM 709]] computer, later ported to the [[IBM 7090]]. SOS was one of the first instances of "[[commons-based peer production]]" now widely used in the development of [[free and open-source software]] such as [[Linux]] and the [[GNU project]]. In 1963 SHARE participated with IBM in the development of the [[PL/I]] programming language as part of the "3x3" group.
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