KUDOS is also a researcher identity system. As I have registered successfully, my paper just appeared in the homepage. So cool! How does it know?!
It is Kudos Innovations Ltd in England, registered in 2016?
It's partners are Altemetric, Crossref, Europe PMC, ORCID, Ringgold, RM, Research Square, ScholarOne (I know it's a paper submission system), Thomson Reuters, and Trend MD.