By "open" we also mean that you can download their database locally and that it has an open license, not just free access.
TODO evaluate:
- www.crossref.org/. No papers by author attempt unless they have ORCID: community.crossref.org/t/get-all-works-of-a-particular-author-without-orcid/3751 so what's the point of this project? www.crossref.org/services/funder-registry/ this Funder registry thing sounds cool though.