Software dependencies. Software citation. Scientific reproducibility. Preservation of legacy software. These phrases bring to mind times we need to communicate about free software. From people who write software to people who organize and provide documentation of software, to end users searching for software, we all need to unambiguously refer to software in its complexity.

We are representing two different initiatives actively building the semantic web of free software by sourcing software metadata, and creating mappings and links to software artifacts. Morane is the metadata lead for Software Heritage, an initiative striving to become the Library of Alexandria for software by collecting all publicly available software in source code form, together with its development history. Kat is metadata lead for Wikidata for Digital Preservation, a collaboration between the Wikidata community and the digital preservation community. Together, we are working to ensure that our approaches to solve the software metadata challenge are interoperable.

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