Fatcat - thoth-pub/thoth GitHub Wiki
Hosted at the Internet Archive, FatCat is
a versioned, user-editable catalog of research publications including journal articles, conference proceedings, and datasets
Features include archival file-level metadata (verified digests and long-term copies), an open, documented API, and work/release indexing (eg, distinguishing between and linking pre-prints, manuscripts, and version-of-record).
Source: https://fatcat.wiki/about
Metadata Sources in FatCat: https://guide.fatcat.wiki/sources.html
Project Status: Beta - API schema is not stable, and all edits must be manually reviewed.
See also https://musingsaboutlibrarianship.blogspot.com/2020/11/more-new-search-discovery-apps-fatcat.html