Microsoft acquired GitHub in 2018. Although GitHub is the largest repository of open source code, version control, and issue tracking, ironically enough, GitHub itself is not open source...
There are lots of alternatives to GitHub, and the one's listed in the article linked below are all open source themselves.
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Best Free and Open Source Alternatives to Microsoft GitHub - LinuxLinks#
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GitHubThis series looks at the best free and open source alternatives to products and services offered by Microsoft.