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A software's source code is what a developer writes. Source code can be just a few lines or quite a few of them. Source code can be made available under a free licence for others to freely distribute, modify and share.
A software licence is a contract between a software's authors and its end-users. So-called "libre" licences grant licensees permission to distribute, modify and share a software's source code.
A "repository" is a place where source code files are stored. This is what you see when you browse a link to a source code as hosted on a software forge. This is also what you copy on your machine to explore it locally.
GitHub allows to have personal accounts or "organizations accounts" to store source code. A "group" is the more or less equivalent notion used on GitLab instances. A public sector organization may have one or more organization accounts and/or groups on one or several software forges.
GitHub allows to get the number of repositories that depend on another repository: the number of "dependants" is listed here in the "Reuse" column of the list of repositories.
A software often use open source libraries. These libraries are called "dependencies". This website allows you to browse dependencies. Only production dependencies are considered, and only those who are required by two or more repositories.
A "forked" repository is repository derived from another one.
Stars allow users to mark a repository as favourite. At the moment, we collect repository favouriteness data from GitHub, Gitlab and instances thereof. Favouriteness is not a source code quality metric.
Source code developed by a public agency must be published, under certain conditions. This website offers the possibility to search within source code repositories that are identified as coming from public sector organisms. It has been developed by Etalab.
Software Heritage is a project which ambition is to collect, preserve, and share all software that is publicly available in source code form. Each repository here referenced is linked to its corresponding Software Heritage archive version.