Eigenfactor.orgFree tool, also included in Journal Citation Reports.
Eigenfactor covers the natural and social sciences and ranks journals according to:
Eigenfactor™ Score(EF): A measure of the overall value provided by all of the articles published in a given journal in a year.
Article Influence™ Score(AI): a measure of a journal's prestige based on per article citations and comparable to Impact Factor.
Title and subject search. Interactive mapping function. The Eigenfactor is