The h-index measures the productivity and citation impact of a certain author. It is important to note that different resources use different algorithms and the h-index can be higher or lower depending on the resource used.
ORCID (Open Researcher and Contributor Identifiers) is a "persistent digital identifier" for manuscripts and grant submissions
Publons is a free research profile for keeping track of not only publications and citation metrics, but also peer reviews performed and journal editing work.