FatCat
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
The Thoth Wiki has been developed in the context of the COPIM (Community-led Open Publication Infrastructures for Monographs) project. Individual contributions to the wiki have been made by Tim Elfenbein, Rupert Gatti, Ross Higman, Vincent W.J. van Gerven Oei, Tobias Steiner and Hannah Hillen under the general editorship of Van Gerven Oei. All data are available under a CC-BY 4.0 license.