The RePEc collection
As stated on the RePEc home page
RePEc (Research Papers in Economics) is a collaborative effort … to enhance the dissemination of research in economics.
We get the data from RePEc AMF dataset interface, roughly once a week.
Thomas Krichel started the first author registration service with RePEc data in 1999. This is the RePEc Author Service. It nows has over 20000 auther registered. It runs the same software as AuthorClaim, but it has some additional features that AuthorClaim does not have yet.